Participants were enrolled in an evaluation of a substance use and sexual risk reduction intervention for 18- to 25-year-olds experiencing homelessness [8] and were initially recruited from drop-in centers serving homeless youth in Los Angeles County. Items on COVID-19 vaccination were added to the 24-month follow-up survey, and the analytic sample comprises the first 134 individuals (of 276; 68% male; 87% non-White) who completed the survey (between March and October 2021). Procedures were approved by the study's Institutional Review Board.
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