Fig. 2.

Ratios of estimated concurrency prevalence, PSI to: DHS—“Original” uses data weighted by the original sample weights for each survey, “Composition Adjusted” uses data weighted to have the same age-sex-marital status composition as the DHS samples, and “2+ partners” is restricted to persons reporting multiple partners in the last year, again using DHS sample weights. Values greater than 1 (dark black line) indicate PSI estimates are higher by the factor shown on the y-axis. The DHS underestimates of the point prevalence of concurrency are particularly severe, and the variations by sex and country are statistically significant