Figure 5.

Population pyramids with the number of individuals, by age and sex, grouped by severity of their disability weight (DW) for all comorbid conditions combined into no disability, very mild disability (DW 0–0·01), mild disability (DW 0·01–0·05), moderate disability (DW 0·05–0·1), severe disability (DW 0·1–0·3), and very severe disability (DW >0·3) for geographies of high (A) and low (B) quintiles of Socio-demographic Index in 2015

Disability weights are combined multiplicatively as 1−(1−DW1)(1− DW2)…(1−DWn) for n comorbid sequelae. Socio-demographic Index (SDI) is calculated for each geography as a function of lag-dependent income per capita, average educational attainment in the population aged over 15 years, and the total fertility rate. SDI units are interpretable; a zero represents the lowest level of income per capita, educational attainment, and highest total fertility rate (TFR) observed from 1980 to 2015 and a one represents the highest income per capita, educational attainment, and lowest TFR observed in the same period. Cutoffs on the SDI scale for the quintiles have been selected based on examination of the entire distribution of geographies between 1980 and 2015.