KFF COVID-19 Vaccine Monitor: Early Omicron Update

This KFF COVID-19 Vaccine Monitor was conducted in English and Spanish with a nationally representative sample of 1,065 U.S. adults aged 18 or older. The survey was conducted online and via phone from December 15-20, 2021, using sample from an online probability-based panel. Sampling, data collection, weighting and tabulation were managed by SSRS of Glen Mills, PA in close collaboration with Kaiser Family Foundation researchers. The KFF team developed the questionnaire, analyzed the data and contributed financing for the survey.

This survey was conducted through the SSRS Opinion Panel, a representative probability-based panel of U.S. adults ages 18 and older including 156 Hispanic and 141 non-Hispanic Black respondents. A total of 985 surveys were completed online and 80 surveys were completed by telephone with panelists who do not have access to the internet.

The combined online and telephone sample was weighted to match the sample demographics to estimates for the national population. A multi-stage weighting process was used to adjust for the fact that not all survey respondents were selected with the same probabilities and to account for systematic non-response. In the first weighting stage, adjustments were made regarding the probability of selection to the SSRS Opinion Panel. Data were next weighted to the U.S. Census’s 2019 American Community Survey, by gender, age, race/ethnicity, education, Census region, and internet usage. The data were also weighted to match civic engagement metrics based on the September 2019 CPS Volunteering and Civic Life Supplement. All statistical tests of significance account for the effect of weighting.

The margin of sampling error including the design effect for the full sample is plus or minus 4 percentage points. Numbers of respondents and margins of sampling error for key subgroups are shown in the table below. For results based on other subgroups, the margin of sampling error may be higher. Sample sizes and margins of sampling error 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. Kaiser Family Foundation public opinion and survey research is a charter member of the Transparency Initiative of the American Association for Public Opinion Research.