Fig. 3: Stratified seroprevalence by demographic group.

Box and whisker plots showing posterior estimates of seroprevalence from n = 7500 iterations of the algorithm to produce adjusted estimates for test performance (Supplementary Methods1), stratified by a age, b insurance type, c race/ethnicity (groups containing n < 50 samples were included in ‘other’) and d sex. The shaded triangle shows the raw seroprevalence estimate. The number of biologically independent samples used to calculate raw and adjusted seroprevalence estimates for each stratified group are shown in the figure legends. The midline of the boxplot shows the median of the posterior, the upper and lower edges of the box show the 25% and 75% quantiles, whiskers show 95% credible interval of the posterior. Points show posterior estimates outside of this interval. For (c), stars (*) indicate the race/ethnic groups where the 2.5% and 97.5% quantiles of the differences in posterior estimates for seroprevalence between samples from Hispanic patients and that group did not cross zero. Crosses (†) indicate the ethnic groups where the 2.5% and 97.5% quantiles of the differences in posterior estimates for seroprevalence between samples from Black or African American patients and that group did not cross zero. For (d) a star (*) indicates that the 2.5% and 97.5% quantiles of the differences in posterior estimates for seroprevalence between Males and Females did not cross zero.