Cover Michigan Survey Methods
The survey data presented in CHRT’s Cover Michigan Survey briefs were produced from a series of survey questions added to the Michigan State University Institute for Public Policy and Social Research (IPPSR) quarterly State of the State Survey. A full report of the IPPSR State of the State Survey methodology can be found at: http://ippsr.msu.edu/soss/ .
Cover Michigan Survey 2015: The survey was fielded between October and December 2015 and included a sample of 972 Michigan adults, with a 17.0 percent response rate. The margin of error for the entire sample was ±3.9 percent. The sampling design, a random stratified sample based on regions within the state, was a telephone survey of Michigan residents conducted via landline and cellular phones.
Cover Michigan Survey 2014: This survey was fielded between September and November 2014 and included a sample of 1,002 Michigan adults with a 20.2 percent response rate. The margin of error for the entire sample was ±3.9 percent with design effects.
Cover Michigan Survey 2012: This survey was fielded between August and October 2012 and included a sample of 1,018 Michigan adults, with a 31.6 percent response rate. The margin of error for the entire sample was ±6.5 percent with design effects.
Cover Michigan Survey 2010: This survey was fielded between October and December 2010 and included a sample of 1,000 Michigan adults, with a 35.6 percent response rate. The margin of error for the entire sample was +/-3.1 percent.
Demographic and socio-economic characteristics of the Cover Michigan Survey samples are described on the following web page: http://www.chrt.org/demographic-socio-economic-characteristics-cover-michigan-sample-surveys/
Analysis: For analytical purposes, survey data were weighted to adjust for the unequal probabilities of selection for each stratum of the survey sample (for example, region of the state, listed vs. unlisted telephones). Additionally, data were weighted to adjust for non-response based on age, gender, and race, according to population distributions from the 2009-2013 American Community Survey data for survey years 2012-2015. Respondents who reported both Medicare and Medicaid coverage were considered Medicaid recipients for the purpose of this analysis. Results were analyzed using the most recent versions of SAS and SPSS software commercially available at the time of the publication of the brief. Statistical significance of bivariate relationships was tested using z tests, odds ratio tests, or chi-square tests. Unless otherwise noted, all results reported were statistically significant at the p < 0.05 level.
Cover Michigan Survey health policy briefs by topic:
Health Care Access and Insurance Churning:
- Insurance Churning (November 2016)
- The Uninsured in Michigan (May 2016)
- Coverage and Health Care Access (March 2015)
- Access to Mental Health Care in Michigan (December 2013)
- Access to Health Care in Michigan (March 2013)
- Cover Michigan Survey 2011 (June 2011)
- Cover Michigan Survey 2010 (March 2010)
Satisfaction with Health Care Coverage:
- Satisfaction with Health Coverage in Michigan (December 2015)
- Health Plan Selection: Factors Influencing Michiganders’ Choice of Health Insurance (May 2015)
- Satisfaction with Health Care Coverage (July 2013)
Wellness and Prevention Programs:
- Wellness Program Participation (July 2016)
- Flu Vaccination in Michigan: Opportunities for Improvement (October 2015)