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Behavioral Risk Factor Surveillance System 2011 summary data quality report
  • Published Date:
Filetype[PDF - 620.80 KB]

  • Corporate Authors:
    Centers for Disease Control and Prevention (U.S.), Office of Surveillance, Epidemiology, and Laboratory Services., Division of Behavioral Surveillance.
  • Description:
    Introduction -- Interpretation of BRFSS response rates -- BRFSS 2011 call outcome measures and response rate formulae -- Tables of outcomes and rates by state - References

    The Behavioral Risk Factor Surveillance System (BRFSS) survey is conducted annually by the Division of Behavioral Surveillance (DBS) at the Centers for Disease Control and Prevention (CDC). After the 2011 BRFSS survey was conducted, this summary data quality report was created, in order to present detailed descriptions of the 2011 BRFSS survey call outcomes in one document. This document, therefore, presents call summary information for each of the states and territories that participated in the 2011 BRFSS. All BRFSS data (with the exception of pilot study data) are collected by phone, and for the first time, cell phone and landline phone samples were used to produce a single data set using data collected from the 2011 BRFSS. The variables and outcomes provided herein are applicable to a combined data set of responses from landline- and cell phone-respondents within each of the states. The inclusion of data from cell phone interviews in the public release data is a major step forward for the BRFSS, and, in many respects, 2011 has been a year of change in terms of the approach and methodology used to conduct this survey. The BRFSS has also adopted new weighting procedures in order to accommodate the inclusion of new variables, including the type of phones owned by respondents. Data users should note that new weighting procedures are likely to affect trend lines when comparing BRFSS pre- and post- 2011; because of these changes, users are advised not to make direct comparisons with pre-2011 data, and instead, begin new trend lines with this year. Details are provided in a recent issue of the Morbidity and Mortality Weekly Report (MMWR), which highlights weighting effects on trend lines.1 The measures presented in this document are designed to summarize the quality of the 2011 BRFSS survey data. Response rates, cooperation rates, and refusal rates for BRFSS are calculated using standards set by the American Association of Public Opinion Research (AAPOR).2 This document includes several other internal changes over previous versions of the Summary Data Quality Report. BRFSS has calculated 2011 response rates using AAPOR Response Rate #4, which is in keeping with rates provided by BRFSS in the past using Council of American Survey Research Organizations (CASRO) rates.2 Based on the guidelines of AAPOR, response rate calculations include assumptions of eligibility among potential respondents/households that are not interviewed. Changes in the distribution of cell phone numbers by telephone companies and the portability of landline telephone numbers are likely to make it extremely more difficult than in the past to ascertain which telephone numbers are out-of-sample and which telephone phone numbers represent "likely households." Therefore, the BRFSS uses proportions of unknown households in each of the states to estimate the total number of households from those whose eligibility is undetermined. This "eligibility factor" appears in calculations of response, cooperation, resolution, and refusal rates. The BRFSS continuously improves and tests its methodology. Currently, DBS is conducting several pilot studies. Multiple-state pilots are assessing mail- and web-based follow-up surveys sent to households that did not respond to landline-based requests to participate in the BRFSS data collection. Similarly, a pilot is being conducted to test the feasibility of text messaging as a means of following up with potential cell phone respondents. Meanwhile, internet sampled Web-based pilots are gauging health status, healthcare use, and health behaviors at Metropolitan/Micropolitan statistical area, state, and national levels, then comparing findings to those of BRFSS, the National Health Interview Survey (NHIS), and the National Health and Nutrition Examination Survey (NHANES).

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