Figure 1. Percentage of Residents Offered Covid-19 Vaccination Who Accepted at Least One Dose.

Shown are the predicted margins estimated from the results of multivariable logistic-regression analyses of the sample of 64,387 incarcerated residents who were offered at least one dose of the BNT162b2 or mRNA-1273 vaccine, with adjustments for room type (defined according to the number of residents housed in a room), participation in penal labor, security level, and prison. Details of the model specification and a complete set of results are provided in Table S3 in the Supplementary Appendix. All the categories of race or ethnic group other than Hispanic indicate non-Hispanic residents. The California Department of Corrections and Rehabilitation (CDCR) developed a risk score to grade residents’ likelihood of severe Covid-19–related disease. The risk score sums weighted values for 17 items identified in the scientific literature as risk factors for severe outcomes after SARS-CoV-2 infection (Table S1). We categorized scores into low risk (score of 0 or 1), medium risk (2 or 3), and high risk (≥4). Residents were considered to have had a history of Covid-19 if they had had a positive test result while in CDCR custody, before the date of the first offer of a vaccine.