Fig. 2

Kaplan–Meier survival curves by lnRCII quartiles for mortality outcomes. Kaplan–Meier survival curves depict the association of lnRCII quartiles (1–4) with mortality outcomes for participants from NHANES and CHARLS cohorts. Analyses include all-cause mortality for NHANES (A) and CHARLS (B) cohort, and cardiovascular mortality (C) and cancer mortality (D) for NHANES cohort. Log-rank tests were used to evaluate differences in survival probabilities among quartile groups