Fig. 3
From: Association between apolipoprotein E ε4 status and the risk of Alzheimer’s disease: a meta-analysis
Forest plots showing hazard ratios (HRs) of disease-free survival (DFS) (A) and funnel plots on DFS (B). Heterogeneity was detected via the chi-square test, where P < 0.05 indicated distinct heterogeneity between studies. Horizontal lines = 95% confidence intervals (CIs). (Fixed: fixed-effects model; horizontal lines = 95% CI. Rhombuses = estimates with corresponding 95% CIs. Squares = individual study point estimates). DFS = disease-free survival, and OS = overall survival