Fig. 6

Slope Index of Inequality (SII) Analysis (A) Absolute Income-Related Health Inequality in PC Burden Presented with Regression Lines, 1990 vs. 2021. A higher SII value indicates greater health inequality, signifying that populations with lower socioeconomic status face a disproportionately higher health burden. (B) Trend in SII from 1990 to 2021, illustrating changes in health inequality over time. This highlights the importance of targeted public health interventions to reduce disparities