Figure 2.

Cross-sectional correlation of sex, age, and district with seroprevalence (A) and antibody titre (B). Abbreviations: BAU/mL, Binding Antibody Units per millilitre; CI, confidence interval; GM, geometric mean. (A) The analysis involved data on 37,065 measurements taken from 28,768 individuals. To test for differences in seroprevalence, we used a generalised estimating equation with a logit link function, a binomial distribution family, an independent variance structure, and an adjustment for sex, age group, and district. (B) The analysis involved data on 35,800 seropositive measurements taken from 27,845 individuals. Seronegativity corresponds to Spike RBD IgG titres < 7.1 BAU/mL. To test for differences in antibody titres, we used a linear mixed model with a random intercept, and an adjustment for sex, age group, and district.