Fig. 6
Health inequality regression curves and concentration curve for alcohol use disorders (A, B,C), drug use disorders (D, E,F), interpersonal violence (G, H,I), and self harm (J, K,L) of DALYs. The concentration curve shows the cumulative distribution of DALYs for several conditions across income groups. A positive concentration index indicates higher burden in high socio-demographic index (SDI) regions, while a negative index suggests higher burden in low-SDI regions. The slope index of inequality (SII) curve is a key tool for quantifying absolute disparities between SDI and health outcomes. SII鈥�>鈥�0 indicates that DALYs increase with higher SDI, SII鈥�<鈥�0 suggests health burdens are concentrated in low-income groups (pro-poor inequality). A larger absolute SII value reflects more severe health inequality. DALYs, disability adjusted life years