MEPS HC-152B: 2012 Dental VisitsJune 2014 Agency for Healthcare Research and Quality A. Data Use Agreement A. Data Use AgreementIndividual identifiers have been removed from the micro-data contained in these files. Nevertheless, under sections 308 (d) and 903 (c) of the Public Health Service Act (42 U.S.C. 242m and 42 U.S.C. 299 a-1), data collected by the Agency for Healthcare Research and Quality (AHRQ) and/or the National Center for Health Statistics (NCHS) may not be used for any purpose other than for the purpose for which they were supplied; any effort to determine the identity of any reported cases is prohibited by law. Therefore in accordance with the above referenced
Federal Statute, it is understood that:
By using these data you signify your agreement to comply with the above stated statutorily based requirements with the knowledge that deliberately making a false statement in any matter within the jurisdiction of any department or agency of the Federal Government violates Title 18 part 1 Chapter 47 Section 1001 and is punishable by a fine of up to $10,000 or up to 5 years in prison. The Agency for Healthcare Research and Quality requests that users cite AHRQ and the Medical Expenditure Panel Survey as the data source in any publications or research based upon these data. B. Background1.0 Household ComponentThe Medical Expenditure Panel Survey (MEPS) provides nationally representative estimates of health care use, expenditures, sources of payment, and health insurance coverage for the U.S. civilian non-institutionalized population. The MEPS Household Component (HC) also provides estimates of respondents’ health status, demographic and socio-economic characteristics, employment, access to care, and satisfaction with health care. Estimates can be produced for individuals, families, and selected population subgroups. The panel design of the survey, which includes 5 Rounds of interviews covering 2 full calendar years, provides data for examining person level changes in selected variables such as expenditures, health insurance coverage, and health status. Using computer assisted personal interviewing (CAPI) technology, information about each household member is collected, and the survey builds on this information from interview to interview. All data for a sampled household are reported by a single household respondent. The MEPS-HC was initiated in 1996. Each year a new panel of sample households is selected. Because the data collected are comparable to those from earlier medical expenditure surveys conducted in 1977 and 1987, it is possible to analyze long-term trends. Each annual MEPS-HC sample size is about 15,000 households. Data can be analyzed at either the person or event level. Data must be weighted to produce national estimates. The set of households selected for each panel of the MEPS HC is a subsample of households participating in the previous year’s National Health Interview Survey (NHIS) conducted by the National Center for Health Statistics. The NHIS sampling frame provides a nationally representative sample of the U.S. civilian non-institutionalized population and reflects an oversample of Blacks and Hispanics. In 2006, the NHIS implemented a new sample design, which included Asian persons in addition to households with Black and Hispanic persons in the oversampling of minority populations. MEPS further oversamples additional policy relevant sub-groups such as low income households. The linkage of the MEPS to the previous year’s NHIS provides additional data for longitudinal analytic purposes. 2.0 Medical Provider ComponentUpon completion of the household CAPI interview and obtaining permission from the household survey respondents, a sample of medical providers are contacted by telephone to obtain information that household respondents can not accurately provide. This part of the MEPS is called the Medical Provider Component (MPC) and information is collected on dates of visit, diagnosis and procedure codes, charges and payments. The Pharmacy Component (PC), a subcomponent of the MPC, does not collect charges or diagnosis and procedure codes but does collect drug detail information, including National Drug Code (NDC) and medicine name, as well as date filled and sources and amounts of payment. The MPC is not designed to yield national estimates. It is primarily used as an imputation source to supplement/replace household reported expenditure information. 3.0 Survey Management and Data CollectionMEPS HC and MPC data are collected under the authority of the Public Health Service Act. Data are collected under contract with Westat, Inc. (MEPS HC) and Research Triangle Institute (MEPS MPC). Data sets and summary statistics are edited and published in accordance with the confidentiality provisions of the Public Health Service Act and the Privacy Act. The National Center for Health statistics (NCHS) provides consultation and technical assistance. As soon as data collection and editing are completed, the MEPS survey data are released to the public in staged releases of summary reports, micro data files, and tables via the MEPS Web site: meps.ahrq.gov. Selected data can be analyzed through MEPSnet, an on-line interactive tool designed to give data users the capability to statistically analyze MEPS data in a menu-driven environment. Additional information on MEPS is available from the MEPS project manager or the MEPS public use data manager at the Center for Financing, Access, and Cost Trends, Agency for Healthcare Research and Quality, 540 Gaither Road, Rockville, MD 20850 (301-427-1406). C. Technical and Programming Information1.0 General InformationThis documentation describes one in a series of public use event files from the 2012 Medical Expenditure Panel Survey (MEPS) Household Component (HC). Released as an ASCII data file (with related SAS, SPSS, and Stata programming statements) and a SAS transport file, the 2012 Dental public use file provides detailed information on dental events for a nationally representative sample of the civilian noninstitutionalized population of the United States. Data from the Dental file can be used to make estimates of dental event utilization and expenditures for calendar year 2012. The file contains 76 variables and has a logical record length of 310 with an additional 2-byte carriage return/line feed at the end of each record. As illustrated below, this file consists of MEPS survey data obtained in the 2012 portion of Round 3 and Rounds 4 and 5 for Panel 16, as well as Rounds 1, 2 and the 2012 portion of Round 3 for Panel 17 (i.e., the rounds for the MEPS panels covering calendar year 2012).
Each record on this event file represents a unique dental event; that is, a dental event reported by the household respondent. Counts of dental event utilization are based entirely on household reports. Dental events were not included in the Medical Provider Component (MPC); therefore, all expenditure and payment data on the Dental event file are reported by the household. Data from this event file can be merged with other
2012 MEPS HC data files for the purposes of appending person-level data such as
demographic characteristics or health insurance coverage to each dental record. This document offers a brief overview of the types and levels of data provided, and the content and structure of the file and the codebook. It contains the following sections: Data File Information For more information on MEPS HC survey design, see T. Ezzati-Rice, et al. (1998-2007) and S. Cohen, 1996. A copy of the MEPS HC survey instrument used to collect the information on the Dental file is available on the MEPS Web site at the following address: meps.ahrq.gov. 2.0 Data File InformationThe 2012 Dental public use data set consists of one event-level data file. The file contains characteristics associated with the dental event and imputed expenditure data. The 2012 Dental public use data set contains 27,085
dental event records; of these records, 26,623 are associated with persons
having a positive person-level weight (PERWT12F). This file includes dental
event (DV) records for all household members who resided in eligible responding
households and reported at least one dental event. Each record represents one
household-reported dental event that occurred during calendar year 2012. Dental
visits known to have occurred before January 1, 2012 and after December 31, 2012
are not included on this file. Some household members may have multiple dental
events and thus will be represented in multiple records on this file. Other
household members may have had reported no dental events and thus will have no
records on this file. These data were collected during the 2012 portion of Round
3, and Rounds 4 and 5 for Panel 16, as well as Rounds 1, 2, and the 2012 portion
of Round 3 for Panel 17 of the MEPS HC. The persons represented on this file had
to meet either (a) or (b) below:
Persons with no dental events for 2012 are not included on this event-level DV file but are represented on the person-level 2012 Full Year Population Characteristics file. Each dental event record includes the following: date of the dental event; type of provider seen; procedure(s) associated with the dental event; whether or not medicines were prescribed; flat fee information; imputed sources of payment; total payment and total charge of the dental event expenditure; and a full-year person-level weight. To append person-level information such as demographic or health insurance coverage to each event record, data from this file can be merged with 2012 MEPS HC person-level data (e.g. Full Year Consolidated or Full Year Population Characteristics files) using the person identifier, DUPERSID. Dental events can also be linked to the MEPS 2012 Prescribed Medicines File. Please see section 5.0 or the 2012 Appendix for details on how to merge MEPS data files. 2.1 Codebook StructureFor most variables on the Dental event file, both weighted and unweighted frequencies are provided in the accompanying codebook. The exceptions to this are weight variables and variance estimation variables. Only unweighted frequencies of these variables are included in the accompanying codebook file. See the Weights Variables list in section D, Variable-Source Crosswalk. The codebook and data file sequence list variables in the following order: Unique person identifier 2.2 Reserved Codes
Generally, values of -1, -7, -8, and -9 for non-expenditure variables have not been edited on this file. The values of -1 and -9 can be edited by the data users/analysts by following the skip patterns in the HC survey questionnaire (located on the MEPS Web site: meps.ahrq.gov/survey_comp/survey_questionnaires.jsp). 2.3 Codebook Format
2.4 Variable Source and Naming ConventionsIn general, variable names reflect the content of the variable, with an eight-character limitation. All imputed/edited variables end with an "X". 2.4.1 Variable - Source CrosswalkVariables were derived from the HC survey
questionnaire or from the CAPI. The source of each variable is identified in
Section D "Variable - Source Crosswalk" in one of four ways:
2.4.2 Expenditure and Source of Payment VariablesThe names of the expenditure and source of payment variables follow a standard convention, are seven characters in length, and end in an "X" indicating edited/imputed. Please note that imputed means that a series of logical edits, as well as an imputation process to account for missing data, have been performed on the variable. The total sum of payments and 12 source of payment variables are named in the following way: The first two characters indicate the type of event: IP - inpatient stay OB - office-based visit In the case of the source of payment variables, the third and fourth characters indicate: SF - self or family OF - other Federal Government In addition, the total charge variable is indicated by TC in the variable name. The fifth and sixth characters indicate the year (12).
The seventh character, "X", indicates the variable is edited/imputed. 2.5 File Contents2.5.1 Survey Administration Variables2.5.1.1 Person Identifiers (DUID, PID, DUPERSID)The dwelling unit ID (DUID) is a five-digit random number assigned after the case was sampled for MEPS. The three-digit person number (PID) uniquely identifies each person within the dwelling unit. The eight-character variable DUPERSID uniquely identifies each person represented on the file and is the combination of the variables DUID and PID. For detailed information on dwelling units and families, please refer to the documentation for the 2012 Full Year Population Characteristics File. 2.5.1.2 Record Identifiers (EVNTIDX, FFEEIDX)EVNTIDX uniquely identifies each dental event (i.e., each record on the Dental file) and is the variable required to link dental events to data files containing details on prescribed medicines (MEPS 2012 Prescribed Medicines file). For details on linking see Section 5.0 or the MEPS 2012 Appendix File, HC-152I. FFEEIDX is a constructed variable that uniquely identifies a flat fee group, that is, all events that were part of a flat fee payment. For example, a charge for orthodontia is typically covered in a flat fee arrangement where all visits are covered under one flat fee dollar amount. These events would have the same value for FFEEIDX. FFEEIDX identifies a flat fee payment that was identified using information from the Household Component. 2.5.1.3 Round Indicator (EVENTRN)EVENTRN indicates the round in which the dental event was reported. Please note: Rounds 3 (partial), 4, and 5 are associated with MEPS survey data collected from Panel 16. Likewise, Rounds 1, 2, and 3 (partial) are associated with data collected from Panel 17. 2.5.1.4 Panel Indicator (PANEL)PANEL is a constructed variable used to specify the panel number for the person. PANEL will indicate either Panel 16 or Panel 17 for each person on the file. Panel 16 is the panel that started in 2011, and Panel 17 is the panel that started in 2012. 2.5.2 Dental Event VariablesThis file contains variables describing dental events reported by household respondents in the Dental Section of the MEPS HC survey questionnaire. 2.5.2.1 Date of Visit (DVDATEYR – DVDATEDD)There are three variables that indicate the day, month, and year a dental event occurred (DVDATEDD, DVDATEMM, and DVDATEYR, respectively). These variables have not been edited or imputed. 2.5.2.2 Type of Provider Seen (GENDENT - DENTYPE)Respondents were asked about the type of provider seen during the dental visit (e.g., general dentist, dental hygienist, or orthodontist). More than one type of provider may have been identified on an event record. 2.5.2.3 Treatment, Procedures, and Services (EXAMINE - DENTMED)Respondents were asked about the types of services or treatments received during the visit (EXAMINE - TMDTMJ), such as root canal or x-rays. More than one type of service or treatment may have been identified on an event record. Some procedures or services identified in DENTOTHR as "Dental services other specify" have been edited to appropriate procedure and service categories. While the unedited versions of these variables are included in the dental event file every year, an edited version of a particular variable is included only if editing was done for that category. Please note that the crosswalk in this document lists all possible edited procedure and service category variables; the edited variables in the data file will differ by year. The DENTMED variable indicates whether or not the household member received a prescription medication during the dental visit. 2.5.3 Flat Fee Variables (FFEEIDX, FFDVTYPE, FFBEF12, FFTOT13)2.5.3.1 Definition of Flat Fee PaymentsA flat fee is the fixed dollar amount a person is charged for a package of services provided during a defined period of time. Examples would be an orthodontist’s fee, which covers multiple visits; or a dental surgeon’s fee, which covers surgical procedure and post-surgical care. A flat fee group is the set of medical services that are covered under the same flat fee payment. The flat fee groups represented on the dental file include flat fee groups where at least one of the health care events, as reported by the HC respondent, occurred during 2012. By definition, a flat fee group can span multiple years. Furthermore, a single person can have multiple flat fee groups. 2.5.3.2 Flat Fee Variable Descriptions2.5.3.2.1 Flat Fee ID (FFEEIDX)As noted earlier in Section 2.5.1.2 "Record Identifiers," the variable FFEEIDX uniquely identifies all events that are part of the same flat fee group for a person. On any 2012 MEPS event file, every event that is part of a specific flat fee group will have the same value for FFEEIDX. Note that prescribed medicine and home health events are never included in a flat fee group and none of the flat fee variables is on those event files. 2.5.3.2.2 Flat Fee Type (FFDVTYPE)FFDVTYPE indicates whether the 2012 dental event is the "stem" or "leaf" of a flat fee group. A stem (records with FFDVTYPE = 1) is the initial dental service (event) which is followed by other dental events that are covered under the same flat fee payment. The leaves of the flat fee group (records with FFDVTYPE = 2) are those dental events that are tied back to the initial medical event (the stem) in the flat fee group. These "leaf" records have their expenditure variables set to zero. For the dental visits that are not part of a flat fee payment, the FFDVTYPE is set to -1, "INAPPLICABLE". 2.5.3.2.3 Counts of Flat Fee Events that Cross Years (FFBEF12, FFTOT13)As described in Section 2.5.3.1, a flat fee payment covers multiple events and the multiple events could span multiple years. For situations where a 2012 dental visit is part of a group of events, and some of the events occurred before or after 2012, counts of the known events are provided on the dental record. Variables that indicate events occurring before or after 2012 are the following: FFBEF12 – indicates total number of pre-2012 events in the same flat fee group as the 2012 dental event. This count would not include 2012 dental events. FFTOT13 – indicates the number of 2013 medical events expected to be in the same flat fee group as the 2012 dental event record. 2.5.3.3 Caveats of Flat Fee GroupsData users/analysts should note that flat fee payments are common on the dental file. There are 3,395 dental events that are identified as being part of a flat fee payment group. In general, every flat fee group should have an initial visit (stem) and at least one subsequent visit (leaf). There are some situations where this is not true. For some of these flat fee groups, the initial visit reported occurred in 2012, but the remaining visits that were part of this flat fee group occurred in 2013. In this case, the 2012 flat fee group represented on this file would consist of one event (the stem). The 2013 "leaf" events that are part of this flat fee group are not represented on the file. Similarly, the household respondent may have reported a flat fee group where the initial visit began in 2011 but subsequent visits occurred during 2012. In this case, the initial visit would not be represented on the file. This 2012 flat fee group would then only consist of one or more leaf records and no stem. Please note that the crosswalk in this document lists all possible flat fee variables. 2.5.4 Condition, Procedure, and Clinical Classification CodesConditions data are not collected for dental events; therefore, this file cannot be linked to the Conditions File. 2.5.5 Expenditure Data2.5.5.1 Definition of ExpendituresExpenditures on this file refer to what is paid for dental services. More specifically, expenditures in MEPS are defined as the sum of payments for care received, including out-of-pocket payments and payments made by private insurance, Medicaid, Medicare, and other sources. The definition of expenditures used in MEPS differs slightly from its predecessors, the 1987 NMES and 1977 NMCES surveys, where "charges" rather than sum of payments were used to measure expenditures. This change was adopted because charges became a less appropriate proxy for medical expenditures during the 1990s due to the increasingly common practice of discounting. Although measuring expenditures as the sum of payments incorporates discounts in the MEPS expenditure estimates, the estimates do not incorporate any payment not directly tied to specific medical care visits, such as bonuses or retrospective payment adjustments paid by third party payers. Another general change from the two prior surveys is that charges associated with uncollected liability, bad debt, and charitable care (unless provided by a public clinic or hospital) are not counted as expenditures because there are no payments associated with those classifications. While charge data are provided on this file, data users/analysts should use caution when working with these data because a charge does not typically represent actual dollars exchanged for services or the resource costs of those services, nor are they directly comparable to the resource costs of those services, nor are they directly comparable to the expenditures defined in the 1987 NMES. For details on expenditure definitions, please reference the following, "Informing American Health Care Policy" (Monheit et al., 2000). AHRQ has developed factors to apply to the 1987 NMES expenditure data to facilitate longitudinal analysis. These factors can be accessed via the CFACT data center. For more information see the Data Center section of the MEPS Web site at meps.ahrq.gov/data_stats/onsite_datacenter.jsp. If examining trends in MEPS expenditures, please refer to section C, sub-section 3.3 for more information. 2.5.5.2 Data Editing and Imputation Methodologies of Expenditure VariablesThe general methodology used for editing and imputing expenditure data is described below. The MPC did not include either the dental events or other medical expenditures (such as glasses, contact lenses, and hearing devices). Therefore, although the general procedures remain the same for dental and other medical expenditures, editing and imputation methodologies were applied only to household-reported data. Please see below for details on the differences between these editing/imputation methodologies. Separate imputations were performed for flat fee and simple events, as well. 2.5.5.2.1 General Data Editing MethodologyLogical edits were used to resolve internal inconsistencies and other problems in the HC survey-reported data. The edits were designed to preserve partial payment data from households and providers, and to identify actual and potential sources of payment for each household-reported event. In general, these edits accounted for outliers, copayments or charges reported as total payments, and reimbursed amounts that were reported as out-of-pocket payments. In addition, edits were implemented to correct for misclassifications between Medicare and Medicaid, and between Medicare HMOs and private HMOs as payment sources. These edits produced a complete vector of expenditures for some events, and provided the starting point for imputing missing expenditures in the remaining events. 2.5.5.2.2 Imputation MethodologiesThe predictive mean matching imputation method was used to impute missing expenditures. This procedure uses regression models (based on events with completely reported expenditure data) to predict total expenses for each event. Then, for each event with missing payment information, a donor event with the closest predicted payment with the same pattern of expected payment sources as the event with missing payment was used to impute the missing payment value. The imputations for the flat fee events were carried out separately from the simple events. The weighted sequential hot-deck procedure was used to impute the missing total charges. This procedure uses survey data from respondents to replace missing data while taking into account the persons’ weighted distribution in the imputation process. 2.5.5.2.3 Dental Data Editing and ImputationExpenditures on visits to dentists were developed in a sequence of logical edits and imputations. The household edits were used to correct obvious errors in the reporting of expenditures, and to identify actual and potential sources of payments. Some of the edits were global (i.e., applied to all events); others were hierarchical and mutually exclusive. One of the more important edits separated flat fee events from simple events. This edit was necessary because groups of events covered by a flat fee (i.e., a flat fee bundle) were edited and imputed separately from individual events each covered by a single charge (i.e., simple events). Dental services were imputed as flat fee events if the charges covered a package of health care services (e.g., orthodontia), and all of the services were part of the same event type (i.e., a pure bundle). If a bundle contained more than one type of event, the services were treated as simple events in the imputations (See Section 2.5.3 for more detail on the definition and imputation of events in flat fee bundles.) Logical edits were also used to sort each event into a specific category for the imputations. Events with complete expenditures were flagged as potential donors for the predictive mean matching imputations, while events with missing expenditure data were assigned to various recipient categories. Each event with missing expenditure data was assigned to a recipient category based on the extent of its missing charge and expenditure data. For example, an event with a known total charge but no expenditure information was assigned to one category, while an event with a known total charge and partial expenditure information was assigned to a different category. Similarly, events without a known total charge and no or partial expenditure information were assigned to various recipient categories. The logical edits produced nine recipient categories for events with missing data. Eight of the categories were for events with a common pattern of missing data and a primary payer other than Medicaid. Medicaid events were imputed separately because persons on Medicaid rarely know the provider’s charge for services or the amount paid by the state Medicaid program. As a result, the total charge for Medicaid-covered services was imputed and discounted to reflect the amount that a state program would pay for the care. Separate predictive mean matching imputations were used to impute missing data in each of the eight recipient categories. The donor pool included "free events" because, in some instances, providers are not paid for their services. These events represent charity care, bad debt, provider failure to bill, and third party payer restrictions on reimbursement in certain circumstances. If free events were excluded from the donor pool, total expenditures would be over-counted because the distribution of free event among complete events (donors) is not represented among incomplete events (recipients). 2.5.5.3 Imputation Flag Variable (IMPFLAG)IMPFLAG is a six-category variable that indicates if the event contains complete Household Component (HC) or Medical Provider Component (MPC) data, was fully or partially imputed, or was imputed in the capitated imputation process (for OP and MV events only). The following list identifies how the imputation flag is coded; the categories are mutually exclusive. IMPFLAG = 0 not eligible for imputation (includes zeroed out and flat fee leaf events) IMPFLAG = 1 complete HC data IMPFLAG = 2 complete MPC data (not applicable to DV events) IMPFLAG = 3 fully imputed IMPFLAG = 4 partially imputed IMPFLAG = 5 complete MPC data through capitation imputation (not applicable to DV events) 2.5.5.4 Flat Fee ExpendituresThe approach used to count expenditures for flat fees was to place the expenditure on the first visit of the flat fee group. The remaining visits have zero payments. Thus, if the first visit in the flat fee group occurred prior to 2012, all of the events that occurred in 2012 will have zero payments. Conversely, if the first event in the flat fee group occurred at the end of 2012, the total expenditure for the entire flat fee group will be on that event, regardless of the number of events it covered after 2012. See Section 2.5.3 for details on the flat fee variables. 2.5.5.5 Zero ExpendituresAs noted above, there are some dental events reported by respondents where the payments were zero. This could occur for several reasons including (1) the visit was covered under a flat fee arrangement (flat fee payments are included only on the first event covered by the arrangement), (2) there was no charge for a follow-up visit, (3) the provider was never paid directly for services provided by an individual, insurance plan, or other source, (4) charges were included in another bill, or (5) event was paid through government or privately funded research or clinical trial. If all of the medical events for a person fell into one of these categories, then the total annual expenditures for that person would be zero. 2.5.5.6 Sources of PaymentIn addition to total expenditures, variables are
provided which itemize expenditures according to major source of payment
categories. These categories are:
Though relatively small in magnitude, data users/analysts should exercise caution when interpreting the expenditures associated with these two additional sources of payment. While these payments stem from apparent inconsistent responses to health insurance and source of payment questions in the survey, some of these inconsistencies may have logical explanations. For example, private insurance coverage in MEPS is defined as having a major medical plan covering hospital and physician services. If a MEPS sampled person did not have such coverage but had a single service type insurance plan (e.g., dental insurance) that paid for a particular episode of care, those payments may be classified as "other private." Some of the "other public" payments may stem from confusion between Medicaid and other state and local programs or may be from persons who were not enrolled in Medicaid, but were presumed eligible by a provider who ultimately received payments from the public payer. 2.5.5.7 Dental Expenditure Variables (DVSF12X - DVTC12X)DVSF12X - DVOT12X are the 12 sources of payment. DVXP12X is the sum of the 12 sources of payment for the dental expenditures, and DVTC12X is the total charge. The 12 sources of payment are: self/family (DVSF12X), Medicare (DVMR12X), Medicaid (DVMD12X), private insurance (DVPV12X), Veterans Administration/CHAMPVA (DVVA12X), TRICARE (DVTR12X), other Federal sources (DVOF12X), State and Local (non-federal) government sources (DVSL12X), Workers’ Compensation (DVWC12X), other private insurance (DVOR12X), other public insurance (DVOU12X), and other insurance (DVOT12X). 2.5.5.8 RoundingExpenditure variables on the 2012 dental file have been rounded to the nearest penny. Person-level expenditure information to be released on the MEPS 2012 Full Year Consolidated File will be rounded to the nearest dollar. It should be noted that using the MEPS event files to create person-level totals will yield slightly different totals than those found on the full-year consolidated file. These differences are due to rounding only. Moreover, in some instances, the number of persons having expenditures on the event files for a particular source of payment may differ from the number of persons with expenditures on the person-level expenditure file for that source of payment. This difference is also an artifact of rounding only. 3.0 Sample Weight (PERWT12F)3.1 OverviewThere is a single full-year person-level weight (PERWT12F) assigned to each record for each key, in-scope person who responded to MEPS for the full period of time that he or she was in-scope during 2012. A key person either was a member of a responding NHIS household at the time of interview, or joined a family associated with such a household after being out-of-scope at the time of the NHIS (the latter circumstance includes newborns as well as those returning from military service, an institution, or residence in a foreign country). A person is in-scope whenever he or she is a member of the civilian non-institutionalized portion of the U.S. population. 3.2 Details on Person Weight ConstructionThe person-level weight PERWT12F was developed in several stages. First, person-level weights for Panel 16 and Panel 17 were created separately. The weighting process for each panel included adjustments for nonresponse over time and calibration to independent population totals. The calibration was initially accomplished separately for each panel by raking the corresponding sample weights for those in-scope at the end of the calendar year to Current Population Survey (CPS) population estimates based on five variables. The five variables used in the establishment of the initial person-level control figures were: census region (Northeast, Midwest, South, West); MSA status (MSA, non-MSA); race/ethnicity (Hispanic; Black, non-Hispanic; Asian, non-Hispanic; and other); sex; and age. A 2012 composite weight was then formed by multiplying each weight from Panel 16 by the factor .49 and each weight from Panel 17 by the factor .51. The choice of factors reflected the relative sample sizes of the two panels, helping to limit the variance of estimates obtained from pooling the two samples. The composite weight was raked to the same set of CPS-based control totals. When the poverty status information derived from income variables became available, a final raking was undertaken on the previously established weight variable. Control totals were established using poverty status (five categories: below poverty, from 100 to 125 percent of poverty, from 125 to 200 percent of poverty, from 200 to 400 percent of poverty, at least 400 percent of poverty), the other five variables previously used in the weight calibration, as well as age categories cross-classified with categories associated with numbers of office-based visits and age categories cross-classified with categories reflecting the number of prescribed medicines purchased. 3.2.1 MEPS Panel 16 Weight Development ProcessThe person-level weight for MEPS Panel 16 was developed using the 2011 full year weight for an individual as a “base” weight for survey participants present in 2011. For key, in-scope members who joined an RU sometime in 2012 after being out-of-scope in 2011, the initially assigned person-level weight was the corresponding 2011 family weight. The weighting process included an adjustment for person-level nonresponse over Rounds 4 and 5 as well as raking to population control totals for December 2012 for key, responding persons in-scope on December 31, 2012. These control totals were derived by scaling back the population distribution obtained from the March 2013 CPS to reflect the December 31, 2012 estimated population total (estimated based on Census projections for January 1, 2013). Variables used for person-level raking included: census region (Northeast, Midwest, South, West); MSA status (MSA, non-MSA); race/ethnicity (Hispanic; Black, non-Hispanic; Asian, non-Hispanic; and other); sex; and age. (Poverty status is not included in this version of the MEPS full year database because of the time required to process the income data collected and then assign persons to a poverty status category). The final weight for key, responding persons who were not in-scope on December 31, 2012 but were in-scope earlier in the year was the person weight after the nonresponse adjustment. It may be noted that there were several features to the MEPS sample design employed for Panel 16 reflected in the Panel 16 weight that differed from previous panels: a sampling domain associated with those with cancer; a partitioning of the “Other” race/ethnicity sample domain into those who fully completed the NHIS survey and those who only partially completed it; and a small experiment conducted in 11 PSUs, where some non respondents were subsampled for fielding purposes. More details can be found in the MEPS PUF documentation for the 2012 Full Year Population Characteristics File (HC-149). 3.2.2 MEPS Panel 17 Weight Development ProcessThe person-level weight for MEPS Panel 17 was developed using the 2012 MEPS Round 1 person-level weight as a “base” weight. For key, in-scope members who joined an RU after Round 1, the Round 1 family weight served as a “base” weight. The weighting process included an adjustment for nonresponse over the remaining data collection rounds in 2012 as well as raking to the same population control figures for December 2012 used for the MEPS Panel 16 weights for key, responding persons in-scope on December 31, 2012. The same five variables employed for Panel 16 raking (census region, MSA status, race/ethnicity, sex, and age) were used for Panel 17 raking. Again, the final weight for key, responding persons who were not in-scope on December 31, 2012 but were in-scope earlier in the year was the person weight after the nonresponse adjustment. Note that the MEPS Round 1 weights for both panels incorporated the following components: a weight reflecting the original household probability of selection for the NHIS and an adjustment for NHIS nonresponse; a factor representing the proportion of the 16 NHIS panel-quarter combinations eligible for MEPS; the oversampling of certain subgroups for MEPS among the NHIS household respondents eligible for MEPS; ratio-adjustment to NHIS-based national population estimates at the household (occupied DU) level; adjustment for nonresponse at the DU level for Round 1; and poststratification to U.S. civilian non institutionalized population estimates at the family and person level obtained from the March CPS. While most of the new Panel 16 design features were not retained for Panel 17, the partitioning of the “Other” race/ethnicity domain into domains reflecting NHIS “full completes” and “partial completes” was retained. 3.2.3 The Final Weight for 2012The final raking of those in-scope at the end of the year has been described above. In addition, the composite weights of two groups of persons who were out-of-scope on December 31, 2012 were poststratified. Specifically, the weights of those who were in-scope some time during the year, out-of-scope on December 31, and entered a nursing home during the year were poststratified to a corresponding control total obtained from the 1996 MEPS Nursing Home Component. The weights of persons who died while in-scope during 2012 were poststratified to corresponding estimates derived using data obtained from the Medicare Current Beneficiary Survey (MCBS) and Vital Statistics information provided by the National Center for Health Statistics (NCHS). Separate decedent control totals were developed for the “65 and older” and “under 65” civilian noninstitutionalized decedent populations. In developing the final person-level weight for 2012 (PERWT12F), two raking dimensions were added. One reflected the MEPS 2009-2011 estimated average annual distribution of office-based visits by age (under 65, 65 and over) while the other reflected the MEPS 2009-2011 estimated average distribution of prescription medicine purchases, also by the same age groups. These additional adjustments were included to better reflect benchmark trends for these two measures of health care utilization. For each category of the additional two raking dimensions, the tables below show the ratio of the weighted estimate of persons that resulted from including the additional raking dimension to the weighted estimate of persons without the additional dimension.
Overall, the weighted population estimate for the civilian non-institutionalized population for December 31, 2012 is 309,875,841 (PERWT12F>0 and INSC1231=1). The sum of the person-level weights across all persons assigned a positive person-level weight is 313,489,853. 3.2.4 CoverageThe target population for MEPS in this file is the 2012 U.S. civilian noninstitutionalized population. However, the MEPS sampled households are a subsample of the NHIS households interviewed in 2010 (Panel 16) and 2011 (Panel 17). New households created after the NHIS interviews for the respective Panels and consisting exclusively of persons who entered the target population after 2010 (Panel 16) or after 2011 (Panel 17) are not covered by MEPS. Neither are previously out-of-scope persons who join an existing household but are unrelated to the current household residents. Persons not covered by a given MEPS panel thus include some members of the following groups: immigrants; persons leaving the military; U.S. citizens returning from residence in another country; and persons leaving institutions. The set of uncovered persons constitutes only a small segment of the MEPS target population. 3.3 Using MEPS Data for Trend AnalysisMEPS began in 1996, and the utility of the survey for analyzing health care trends expands with each additional year of data. However, it is important to consider a variety of factors when examining trends over time using MEPS. Statistical significance tests should be conducted to assess the likelihood that observed trends may be attributable to sampling variation. The length of time being analyzed should also be considered. In particular, large shifts in survey estimates over short periods of time (e.g. from one year to the next) that are statistically significant should be interpreted with caution, unless they are attributable to known factors such as changes in public policy, economic conditions, or MEPS survey methodology. Looking at changes over longer periods of time can provide a more complete picture of underlying trends. Analysts may wish to consider using techniques to evaluate, smooth, or stabilize analyses of trends using MEPS data such as comparing pooled time periods (e.g. 1996-97 versus 2011-12), working with moving averages, or using modeling techniques with several consecutive years of MEPS data to test the fit of specified patterns over time. Moreover, analyses of trends in health care utilization should be undertaken with awareness of relevant adjustments to the analytic weight (e.g., see section 3.2.3 on the Final Person-Level Weight for 2012). Finally, researchers should be aware of the impact of multiple comparisons on Type I error. Without making appropriate allowance for multiple comparisons, undertaking numerous statistical significance tests of trends increases the likelihood of concluding that a change has taken place when one has not. 4.0 Strategies for Estimation4.1 Developing Event-Level EstimatesThe data in this file can be used to develop national
2012 event-level estimates for the U.S. civilian noninstitutionalized population
on dental visits as well as expenditures, and sources of payment for these
visits. The weight assigned to each dental visit reported is the person-level
weight of the person who visited the dentist. If a person reported several
visits, each visit is assigned that individual’s person-level weight. Estimates
of total visits are the sum of the weight variable (PERWT12F) across relevant
event records while estimates of other variables must be weighted by PERWT12F to
be nationally representative. For example, the appropriate estimate for the mean
out-of-pocket payment per dental visit can be represented as follows (the
subscript ‘j’ identifies each event and represents a numbering of events from 1
through the total number of events in the file): (Σ Wj Xj)/(Σ Wj), where, Wj = PERWT12Fi (full year person
weight for the person associated with event j), and Estimates and corresponding standard errors (SE) can be derived using an appropriate computer software package for complex survey analysis such as SAS, Stata, SUDAAN or SPSS (meps.ahrq.gov/survey_comp/standard_errors.jsp). The tables below contain the correct event-level estimates for several key variables on this file. Selected Event-Level Estimates
*Zero payment events can occur in MEPS for the following reasons: (1) the visit was covered under a flat fee arrangement (flat fee payments are included only on the first event covered by the arrangement), (2) there was no charge for a follow-up visit, (3) the provider was never paid directly for services provided by an individual, insurance plan, or other source, (4) charges were included in another bill, or (5) event was paid through government or privately funded research or clinical trial.
4.2 Person-Based Estimates for Dental CareTo enhance analyses of dental care, analysts may link information about dental visits by sample persons in this file to the annual full year consolidated file (which has data for all MEPS sample persons), or conversely, link person-level information from the full year consolidated file to this event-level file (see Section 5 below for more details). Both this file and the full year consolidated file may be used to derive estimates for persons with dental care and annual estimates of total expenditures. However, if the estimate relates to the entire population, this file cannot be used to calculate the denominator, as only those persons with at least one dental visit are represented on this data file. Therefore, the full year consolidated file must be used for person-level analyses that include both persons with and without dental care. 4.3 Variables with Missing ValuesIt is essential that the analyst examine all variables
for the presence of negative values used to represent missing values. For
continuous or discrete variables, where means or totals may be estimated, it may
be necessary to set negative values to values appropriate to the analytic needs.
That is, the analyst should either impute a value or set the value to one that
will be interpreted as missing by the computing language used. For categorical
and dichotomous variables, the analyst may want to consider whether to recode or
impute a value for cases with negative values or whether to include or exclude
such cases in the numerator and/or denominator when calculating proportions. 4.4 Variance Estimation (VARPSU, VARSTR)MEPS has a complex sample design. To obtain estimates of variability (such as the standard error of sample estimates or corresponding confidence intervals) for MEPS estimates, analysts need to take into account the complex sample design of MEPS for both person-level and family-level analyses. Several methodologies have been developed for estimating standard errors for surveys with a complex sample design, including the Taylor-series linearization method, balanced repeated replication, and jackknife replication. Various software packages provide analysts with the capability of implementing these methodologies. Replicate weights have not been developed for the MEPS data. Instead, the variables needed to calculate appropriate standard errors based on the Taylor-series linearization method are included on this file as well as all other MEPS public use files. Software packages that permit the use of the Taylor-series linearization method include SUDAAN, Stata, SAS (version 8.2 and higher), and SPSS (version 12.0 and higher). For complete information on the capabilities of each package, analysts should refer to the corresponding software user documentation. Using the Taylor-series linearization method, variance estimation strata and the variance estimation PSUs within these strata must be specified. The variables VARSTR and VARPSU on this MEPS data file serve to identify the sampling strata and primary sampling units required by the variance estimation programs. Specifying a "with replacement" design in one of the previously mentioned computer software packages will provide estimated standard errors appropriate for assessing the variability of MEPS survey estimates. It should be noted that the number of degrees of freedom associated with estimates of variability indicated by such a package may not appropriately reflect the number available. For variables of interest distributed throughout the country (and thus the MEPS sample PSUs), one can generally expect to have at least 100 degrees of freedom associated with the estimated standard errors for national estimates based on this MEPS database. Prior to 2002, MEPS variance strata and PSUs were developed independently from year to year, and the last two characters of the strata and PSU variable names denoted the year. However, beginning with the 2002 Point-in-Time PUF, the variance strata and PSUs were developed to be compatible with all future PUFs until the NHIS design changed. Thus, when pooling data across years 2002 through the Panel 11 component of the 2007 files, the variance strata and PSU variables provided can be used without modification for variance estimation purposes for estimates covering multiple years of data. There were 203 variance estimation strata, each stratum with either two or three variance estimation PSUs. From Panel 12 of the 2007 files, a new set of variance strata and PSUs were developed because of the introduction of a new NHIS design. There are 165 variance strata with either two or three variance estimation PSUs per stratum, starting from Panel 12. Therefore, there are a total of 368 (203+165) variance strata in the 2007 Full Year file as it consists of two panels that were selected under two independent NHIS sample designs. Since both MEPS panels in the Full Year 2008 file and beyond are based on the new NHIS design, there are only 165 variance strata. These variance strata (VARSTR values) have been numbered from 1001 to 1165 so that they can be readily distinguished from those developed under the former NHIS sample design in the event that data are pooled for several years. If analyses call for pooling MEPS data across several
years, in order to ensure that variance strata are identified appropriately for
variance estimation purposes, one can proceed as follows:
5.0 Merging/Linking MEPS Data FilesData from this file can be used alone or in conjunction with other files for different analytic purposes. This section summarizes various scenarios for merging/linking MEPS event files. The set of households selected for MEPS is a subsample of those participating in the National Health Interview Survey (NHIS), thus, each MEPS panel can also be linked back to the previous year’s NHIS public use data files. For information on obtaining MEPS/NHIS link files please see meps.ahrq.gov/data_stats/more_info_download_data_files.jsp. 5.1 Linking to the Person-Level FileMerging characteristics of interest from other MEPS
files (e.g., 2012 Full Year Consolidated File or 2012 Prescribed Medicines File)
expands the scope of potential estimates. For example, to estimate the total
number of dental events of persons with specific demographic characteristics
(such as age, race, and sex), population characteristics from a person-level
file need to be merged onto the Dental file. This procedure is shown below. The
MEPS 2012 Appendix File, HC-152I, provides additional details of how to merge
other MEPS data files.
The following is an example of SAS code which completes these steps: PROC SORT DATA=HCXXX (KEEP=DUPERSID AGE31X AGE42X
AGE53X SEX RACEV1X EDUCYR EDUYRDEG EDRECODE) OUT=PERSX; PROC SORT DATA=DENT; DATA NEWDENT; The MEPS 2012 Appendix File, HC-152I, provides examples of how to merge other MEPS data files. 5.2 Linking to the Prescribed Medicines FileThe RXLK file provides a link from the MEPS event files to the 2012 Prescribed Medicines Event File. When using RXLK, data users/analysts should keep in mind that one dental visit can link to more than one prescribed medicine record. Conversely, a prescribed medicine event may link to more than one dental visit or different types of events. When this occurs, it is up to the data user/analyst to determine how the prescribed medicine expenditures should be allocated among those medical events. For detailed linking examples, including SAS code, data users/analysts should refer to the MEPS 2012 Appendix File, HC-152I. 5.3 Linking to the Medical Conditions FileConditions data are not collected for Dental events; therefore, this file cannot be linked to the Conditions File. ReferencesCohen, S.B. (1996). The Redesign of the Medical Expenditure Panel Survey: A Component of the DHHS Survey Integration Plan. Proceedings of the COPAFS Seminar on Statistical Methodology in the Public Service. Ezzati-Rice, T.M., Rohde, F., Greenblatt, J., Sample Design of the Medical Expenditure Panel Survey Household Component, 1998–2007. Methodology Report No. 22. March 2008. Agency for Healthcare Research and Quality, Rockville, MD. Monheit, A.C., Wilson, R., and Arnett, III, R.H. (Editors) (1999). Informing American Health Care Policy. Jossey-Bass Inc, San Francisco. Shah, B.V., Barnwell, B.G., Bieler, G.S., Boyle, K.E., Folsom, R.E., Lavange, L., Wheeless, S.C., and Williams, R. (1996). Technical Manual: Statistical Methods and Algorithms Used in SUDAAN Release 7.0, Research Triangle Park, NC: Research Triangle Institute. D. Variable-Source CrosswalkVARIABLE-SOURCE CROSSWALK FOR MEPS HC-152B: 2012 DENTAL VISITS
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