Figure 2 A mini meta-analysis of prospective studies on physical activities and risk of Parkinson disease (PD) in men and women

Odds ratios (OR) and 95% confidence intervals (CI) were between the highest activity levels and the lowest. Squares indicate the individual OR in each study. The size of each square is proportional to the percent weight of that individual study in the meta-analysis, and the horizontal line represents the 95% CI. Pooled ORs and 95% CIs are indicated by the solid diamonds. The pooled p values were 0.0002 for men, 0.02 for women, and <0.0001 for men and women combined.