Fig. 4

Relative uncertainty in HIV prevalence, 2018. Overlapping population-weighted quartiles of HIV prevalence (constructed separately for each demographic group) and relative 95% uncertainty in 2018 at the 5 × 5-km grid cell level for select demographic groups: a all adults, ages 15–59 years; b males and c females ages 15–19 years; d males and e females ages 35–39 years; and f males and g females ages 55–59 years. Relative uncertainty is defined as the ratio of the width of the 95% uncertainty interval to the mean estimate. Maps reflect national boundaries, land cover, lakes, and population; areas with fewer than ten people per 1 × 1 km, and classified as barren or sparsely vegetated, are colored light gray. Countries colored in dark gray were not included in the analysis