A Tale of Two Methods: Comparing mail and RDD data collection for the Minnesota Adult Tobacco Survey III Wendy Hicks and David Cantor Westat Ann St. Claire, ClearWay Minnesota sm Rebecca Fee, Blue Cross and Blue Shield of Minnesota Peter Rhode, Minnesota Department of Health
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Wendy Hicks and David Cantor Westat Ann St. Claire, ClearWay Minnesota sm Rebecca Fee,
A Tale of Two Methods: Comparing mail and RDD data collection for the Minnesota Adult Tobacco Survey III. Wendy Hicks and David Cantor Westat Ann St. Claire, ClearWay Minnesota sm Rebecca Fee, Blue Cross and Blue Shield of Minnesota Peter Rhode, Minnesota Department of Health. - PowerPoint PPT Presentation
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A Tale of Two Methods: Comparing mail and RDD data collection for the Minnesota Adult Tobacco Survey III
Wendy Hicks and David Cantor
Westat
Ann St. Claire,
ClearWay Minnesotasm
Rebecca Fee,
Blue Cross and Blue Shield of Minnesota
Peter Rhode,
Minnesota Department of Health
2
Overview of Presentation
• Report results of a feasibility study comparing mail and telephone data collection methods Seeming declines in RDD response rates (Curtin et al,
2005) Changes in coverage of the telephone population
(Blumberg et al, 2006, 2007) Increasing costs associated with RDD surveys
• Findings mostly replicate those reported by Link et al. (2006)
• Some suggestion that an “all adult” selection method in a mail survey results in biased estimates for young adults (18-24 year olds)
3
Methodological Approach
• Mail survey has small sample and large confidence intervals Contrast results found in a parallel mail vs. telephone
study for which mail study selected individuals rather than addresses
Bring in similar findings from another pilot study (Health Information National Trends Survey, HINTS)
4
MATS Overview
• Minnesota Adult Tobacco Survey (MATS)
ClearWay Minnesotasm
Blue Cross and Blue Shield of Minnesota Minnesota Department of Health
• Major objective of MATS: collect a diverse set of public health data about adult pop in MN, focusing on tobacco and cigarette use
• MATS samples from two frames RDD Blue Cross member list frame
5
Overview of MATS 2007 samples by mode and frame
Telephone
(Feb – June, 2007)
Mail
(March – June, 2007)
General population samples
• targeted 7500 completes
• oversampled young adults & African Americans
• selected one individual within household
• sampled 1200 addresses
• no oversampling
• “all adults” selected to respond
BCBS member list
• targeted 5000 completes
• oversampled young adults
• selected individual BC member
• sampled 1200 members
• no oversampling
• selected individual BC member
6
USPS Mail Data Collection
• All adult respondent selection mechanism
• Mailing package included 4 identical questionnaires and return envelopes
“Each adult living at this address should complete one of the enclosed questionnaires. Please give one of the enclosed questionnaires and an envelope to each person 18 years old or older living at this address.”
• Some differences from the CATI instrument to make it more suitable to paper, self-administration
7
Response rates by frame and mode
MAIL TELEPHONE
General Population Frame
(USPS and RDD-only)
31% - 33% 41%
BCBS Member List 56% 48%
8
Nonresponse and coverage error by mode
• 9.3% weighted estimate of cell-phone only households in the USPS survey
• Generally, the demographic distributions for mail and telephone respondents parallel one another Overall, more missing data in mail than telephone
• USPS vs. RDD-only respondents (differences of 3% plus) USPS has fewer HS grads, larger underestimate relative to CPS USPS has fewer 65+, smaller overestimate relative to CPS USPS has fewer 1-adult households and more 4+ adult
households, closer distribution to CPS
9
Nonresponse and coverage error by mode
• Similar story for the BC member list, generally the distributions for mail and telephone parallel BC-M had fewer “high school grads” and “some college” BC-M had more “married” than phone respondents