Reduced Risk of Parkinson’s Disease in Users of Calcium Channel Blockers: A Meta-Analysis

Figure 2

Combined estimate of risk ratio and 95% confidence intervals of Parkinson’s disease associated with calcium channel blockers use based on six studies (three case-control and three cohort) of 27,67,990 subjects including 11,941 PD cases. Squares indicate RR in each study. The square size is proportional to the weight of the corresponding study in the meta-analysis; the length of horizontal lines represents the 95% CI. The shaded diamond indicates the combined RR and 95% CI (random-effects model).