Fig. 3

Forest plots for advanced age. a Sensitivity analysis for advanced age as a continuous variable (per year increase); b Subgroup analysis for advanced age as a dichotomous variable (age > 70 vs. ≤70 and age > 80 vs. ≤80); c Forest plot for advanced age as a stratification variable (60–69 years vs. 70–79 years); d Forest plot for advanced age as a stratification variable (60–69 years vs. 80–89 years); e Forest plot for advanced age as a stratification variable (60–69 years vs. ≥90 years)