Cases that failed both attention check questions, those with over 30% item non-response, and cases with a length less than one quarter of the mean length by mode were flagged and reviewed. The online questionnaire included two questions designed to establish that respondents were paying attention. Respondents in the phone samples received a $15 incentive via a check received by mail, and web respondents received a $5 electronic gift card incentive (some harder-to-reach groups received a $10 electronic gift card). Stratification was based on incidence of the race/ethnicity groups within each frame. Phone numbers used for the prepaid cell phone component were randomly generated from a cell phone sampling frame with disproportionate stratification aimed at reaching Hispanic and non-Hispanic Black respondents. 961 panel members completed the survey online and panel members who do not use the internet were reached by phone (25).Īnother 285 ( n=40 in Spanish) interviews were conducted from a random digit dial telephone sample of prepaid cell phone numbers obtained through MSG. For the online panel component, invitations were sent to panel members by email followed by up to three reminder emails. Postal Service’s Computerized Delivery Sequence (CDS) (b) from a dual-frame random digit dial (RDD) sample provided by MSG. The SSRS Opinion Panel is a nationally representative probability-based panel where panel members are recruited randomly in one of two ways: (a) Through invitations mailed to respondents randomly sampled from an Address-Based Sample (ABS) provided by Marketing Systems Groups (MSG) through the U.S. The sample includes 986 adults reached through the SSRS Opinion Panel either online or over the phone ( n=33 in Spanish). adults in English (1,198) and in Spanish (73). The survey was conducted March 14-23, 2023, online and by telephone among a nationally representative sample of 1,271 U.S. This KFF Health Tracking Poll was designed and analyzed by public opinion researchers at KFF.
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