Kaiser Health Tracking Poll: April 2013
This Kaiser Health Tracking Poll was designed and analyzed by public opinion researchers at the Kaiser Family Foundation led by Mollyann Brodie, Ph.D., including Claudia Deane and Sarah Cho. The survey was conducted April 15-20, 2013, among a nationally representative random digit dial telephone sample of 1,203 adults ages 18 and older, living in the United States, including Alaska and Hawaii (note: persons without a telephone could not be included in the random selection process). Computer-assisted telephone interviews conducted by landline (601) and cell phone (602, including 339 who had no landline telephone) were carried out in English and Spanish by Princeton Data Source under the direction of Princeton Survey Research Associates International (PSRAI). Both the landline and cell phone samples were provided by Survey Sampling International, LLC. For the landline sample, respondents were selected by asking for the youngest adult male or female currently at home based on a random rotation. If no one of that gender was available, interviewers asked to speak with the youngest adult of the opposite gender. For the cell phone sample, interviews were conducted with the person who answered the phone.
The combined landline and cell phone sample was weighted to balance the sample demographics to match estimates for the national population data from the Census Bureau’s 2011 American Community Survey (ACS) on sex, age, education, race, Hispanic origin, nativity (for Hispanics only), and region along with data from the 2010 Census on population density. The sample was also weighted to match current patterns of telephone use using data from the January-June 2012 National Health Interview Survey. The weight takes into account the fact that respondents with both a landline and cell phone have a higher probability of selection in the combined sample and also adjusts for the household size for the landline sample. All statistical tests of significance account for the effect of weighting. Weighted and unweighted values for key demographic variables are shown in the table below.
|HS Graduate or Less||29.1%||41.6%|
|Some College/Assoc. Degree||28.8%||30.7%|
|Hisp – US born||7.6%||7.2%|
|Hisp – born outside||4.7%||6.9%|
The margin of sampling error including the design effect for the full sample is plus or minus 3 percentage points. For results based on subgroups, the margin of sampling error may be higher. Sample sizes and margin of sampling errors for other subgroups are available by request. Note that sampling error is only one of many potential sources of error in this or any other public opinion poll.
The response rate calculated based on the American Association for Public Opinion Research’s Response Rate 3 formula was 10 percent for the landline sample and 11 percent for the cell phone sample.
Methodology for Omnibus Supplement
One additional question (about whether the ACA is still law of the land or if it has been repealed or overturned by the Supreme Court) was asked on the Princeton Data Source omnibus survey. Different research clients purchase space on the omnibus survey and therefore additional questions covering a wide variety of topics may have preceded or followed the question. The Kaiser Health Tracking Poll Omnibus Supplement was conducted April 18-21, 2013, among a nationally representative random digit dial telephone sample of 1,002 adults ages 18 and older, living in the continental United States (note: persons without a telephone could not be included in the random selection process). Computer-assisted telephone interviews conducted by landline (501) and cell phone (501, including 237 who had no landline telephone) were carried out in English by Princeton Data Source under the direction of PSRAI.
The margin of sampling error including the design effect for the full sample on the omnibus supplement is plus or minus 4 percentage points. For results based on subgroups, the margin of sampling error may be higher. Sample sizes and margin of sampling errors for other subgroups are available by request. Note that sampling error is only one of many potential sources of error in this or any other public opinion poll.
Full methodological details, including weighted and unweighted values for key demographic variables and response rates are available upon request.