Appendix Table 1.

Survey questions and sources

Survey question	Response options	Question source
If a vaccine to prevent COVID-19 became available to you, how likely are you to choose to get the COVID-19 vaccination?	Very unlikely Somewhat unlikely Neither unlikely nor likely Somewhat likely Very likely	SCCS
Which of the following are reasons you would get a COVID-19 vaccine? Please answer yes or no for each reason. (response order was randomized) I want to protect my family I want to protect my community I want to protect myself I have a chronic health condition, such as asthma or diabetes, so it is important that I have it It would be the best way to avoid getting seriously ill from COVID-19 It would allow me to feel safe around other people Life won’t go back to normal until most people are vaccinated Recommendation of medical professionals Recommendation of political leaders Recommendation of religious leaders Recommendation of friends or family I believe the vaccine is safe	Yes No	May 2020 AP-NORC Center Poll Conducted by The Associated Press-NORC Center for Public Affairs Research
Which of the following are reasons you would NOT get a COVID-19 vaccine? Please answer yes or no for each reason. (response order was randomized) I am allergic to vaccines I don’t like needles I’m not concerned about getting seriously ill from COVID-19 I won’t have time to get vaccinated I would be concerned about getting infected with COVID-19 from the vaccine I would be concerned about side effects from the vaccine I don’t think vaccines work very well The COVID-19 outbreak is not as serious as some people say it is I would be concerned about the cost of the vaccine I think the COVID-19 vaccine will not work Other (please specify)	Yes No	May 2020 AP-NORC Center Poll Conducted by The Associated Press-NORC Center for Public Affairs Research
How confident or unconfident are you that when a vaccine becomes available for coronavirus or COVID-19 it will have been adequately tested for EFFECTIVENESS?	Very unconfident Somewhat unconfident Neither unconfident nor confident Somewhat confident Very confident	Kaiser Family Foundation, December 8, 2020
How confident or unconfident are you that when a vaccine becomes available for coronavirus or COVID-19 it will have been adequately tested for SAFETY?	Very unconfident Somewhat unconfident Neither unconfident nor confident Somewhat confident Very confident	Kaiser Family Foundation, December 8, 2020
Did you have an influenza vaccination or flu shot between September 2019 and March 2020?	Yes No	Multi-Ethnic Study of Atherosclerosis (MESA)
Will you have or did you already have an influenza vaccination or flu shot between September 2020 and March 2021?	Yes No	Multi-Ethnic Study of Atherosclerosis (MESA)
In general, do you think vaccines given to children for diseases like measles are safe?	Yes No	Economist/YouGov August 2–4 2020