2011-2012 Data Collection Methods
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June 10, 2014 CHIS 2011-2012 Methodology Report Series Report 2 Data Collection Methods CALIFORNIA HEALTH INTERVIEW SURVEY CHIS 2011-2012 METHODOLOGY SERIES REPORT 2 DATA COLLECTION METHODS VERSION DATE: JUNE 10, 2014 This report was prepared for the California Health Interview Survey by Sherman Edwards, Susan Fraser, and Howard King of Westat. www.chis.ucla.edu This report describes how data were collected for CHIS 2011-2012. It was a telephone survey using random digit dialing (RDD) samples of landline and cellular telephone numbers, as well as list samples to augment the yield for certain racial and ethnic groups and an area sample to assess nonresponse bias. All data were collected using a computer-assisted telephone interviewing (CATI) system. Activities included under “data collection” for purposes of this report include Westat involvement in developing and programming the survey instruments, recruiting and training interviewers to administer the survey in five languages, planning and implementing a strategy for release of the sample in the CATI automated scheduler, contacting respondents and conducting interviews, and implementing quality assurance procedures. Suggested citation: California Health Interview Survey. CHIS 2011-2012 Methodology Series: Report 2 – Data Collection Methods. Los Angeles, CA: UCLA Center for Health Policy Research, 2014. Copyright 2014 by the Regents of the University of California. The California Health Interview Survey is a collaborative project of the UCLA Center for Health Policy Research, the California Department of Public Health, and the Department of Health Care Services. Funding for CHIS 2011-2012 came from multiple sources: the Blue Shield of California Foundation, the California Department of Health Care Services, the California Department of Mental Health, the California Department of Public Health, the California Endowment, First 5 California, the California Office of the Patient Advocate, Kaiser Permanente, the NIH National Cancer Institute, NIH Office of Research on Women’s Health, NIH Office of Behavioral and Social Sciences Research, San Diego County Health and Human Services Agency, United American Indian Involvement, Inc./CA Indian Health Service, Archstone Foundation, Susan B. Komen for the Cure, Centers for Disease Control and Prevention, NCI American Cancer Society, NIH RAND, and the California Wellness Foundation. PREFACE Data Collection Methods is the second in a series of methodological reports describing the 2011-2012 California Health Interview Survey (CHIS 2011-2012). The other reports are listed below. A similar set of reports is available for each previous CHIS cycle. CHIS is a collaborative project of the University of California, Los Angeles (UCLA) Center for Health Policy Research, the California Department of Public Health, and the Department of Health Care Services. Westat was responsible for data collection and the preparation of five methodological reports from the 2011- 2012 survey. The survey examines public health and health care access issues in California. The telephone survey is the largest state health survey ever undertaken in the United States. Methodological Report Series for CHIS 2011-2012 The methodological reports for CHIS 2011-2012 are as follows: Report 1: Sample Design; Report 2: Data Collection Methods; Report 3: Data Processing Procedures; Report 4: Response Rates; and Report 5: Weighting and Variance Estimation. The reports are interrelated and contain many references to each other. For ease of presentation, the references are simply labeled by the report numbers given above. After the Preface, each report includes an “Overview” chapter (Chapter 1) that is nearly identical across reports, followed by detailed technical documentation on the specific topic of the report. Report 2: Data Collection Methods (this report) describes how data were collected for CHIS 2011-2012, a random digit dial (RDD) telephone survey of landline and cellular telephone numbers in California, supplemented with list samples to augment the yield for certain racial and ethnic groups. All data were collected using a computer-assisted telephone interviewing (CATI) system. i The purposes of this report are: To serve as a reference for researchers using CHIS 2011-2012 data; To document data collection procedures so that future iterations of CHIS, or other similar surveys, can replicate those procedures if desired; To describe lessons learned from the data collection experience and make recommendations for improving future surveys; and To evaluate the level of effort required for the various kinds of data collection undertaken. Data collection activities in this report include Westat’s involvement in: Developing and programming the survey instruments; Recruiting and training interviewers to administer the survey in five languages; Planning and implementing a strategy for release of the sample in the CATI automated scheduler; Contacting respondents and conducting interviews, and Implementing quality assurance procedures. Special analyses using administrative data from the CATI system inform this report. For further methodological details not covered in this report, refer to the other methodological reports in the series at http://healthpolicy.ucla.edu/chis/design/Pages/methodology.aspx. General information on CHIS data can be found on the California Health Interview Survey Web site at http://www.chis.ucla.edu or by contacting CHIS at [email protected]. ii TABLE OF CONTENTS Chapter Page PREFACE ………………………………………………………………………………………………I 1. CHIS 2011-2012 SAMPLE DESIGN AND METHODOLOGY SUMMARY ................1-1 1.1 Overview ...............................................................................................................1-1 1.2 Switch to a Continuous Survey .............................................................................1-2 1.3 Sample Design Objectives ....................................................................................1-3 1.4 Data Collection .....................................................................................................1-5 1.5 Response Rates .....................................................................................................1-6 1.6 Weighting the Sample .......................................................................................... 1-11 1.7 Imputation Methods ............................................................................................. 1-12 1.8 Methodology Report Series ................................................................................. 1-14 2. SCREENING INTERVIEW AND CATI INSTRUMENT STRUCTURE .......................2-1 2.1 Initial Screening Interview for the Landline and Surname List Samples .............2-1 2.2 Screening Interview for the Cell Sample ..............................................................2-3 2.3 Overall Structure of CHIS 2011-2012 Interviews ................................................2-3 3. EXTENDED INTERVIEWS .............................................................................................3-1 3.1 Questionnaire Development Process ....................................................................3-1 3.2 Questionnaire Content ..........................................................................................3-2 3.3 Translation of Questionnaires ...............................................................................3-5 3.3.1 Letter Translations ......................................................................................... 3-6 3.3.2 Spanish Questionnaire Translation................................................................. 3-6 3.3.3 Asian-language Questionnaire Translations................................................... 3-6 3.4 Pretest and Pilot Test ............................................................................................ 3-7 3.5 Changes in the Questionnaire During Data Collection ........................................ 3-8 4. DATA COLLECTOR RECRUITING AND TRAINING ................................................. 4-1 4.1 Pretest and Pilot Test Recruiting and Training .................................................... 4-1 4.2 Recruiting And Training For English-Language Telephone Interviewing……… 4-1 4.2.1 Recruiting Telephone Data Collectors ........................................................... 4-2 4.2.2 Overview of Training Plan ............................................................................. 4-2 4.2.3 Development of Training Materials ............................................................... 4-4 4.2.4 Training Teams .............................................................................................. 4-5 4.2.5 Stages of Data Collector Training .................................................................. 4-6 4.2.5.1 General Interviewing Techniques ............................................................ 4-7 4.2.5.2 CATI Training with Teltrain .................................................................... 4-7 4.2.5.3 CHIS Project Training – Web-based Self-tutorial Distance Learning…..4-8 4.2.5.4 CHIS Project Training – WebEx Session ................................................ 4-8 4.2.6 Schedule and Number of Data Collectors Trained ........................................ 4-9 4.2.7 Refusal Avoidance and Conversion ............................................................... 4-9 4.2.8 Data Collector Performance ..........................................................................