Fig. 12

Trends in crude STD incidence and STD-related DALYs by SDI and SII from 1990 to 2021. A Crude STD incidence rate by relative SDI rank, with the A crude STD incidence rate by relative SDI rank, with the slope index of inequality (SII) for 1990 and 2021; B Change in SII over time for crude STD incidence; C crude STD-related DALYs rate by relative SDI rank, with the SII for 1990 and 2021. C Crude STD-related DALYs rate by relative SDI rank; D Change in SII over time for crude STD-related DALYs. Circle sizes represent population size for different countries and territories. Circle sizes represent population size for different countries and territories