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Table 2 Subgroup analysis

From: Patients with Parkinson’s disease predict a lower incidence of colorectal cancer

Categories N Pooled RR 95% CI P value Heterogeneity
I2 P′
Study design
 Cohort 13 0.78 0.66–0.91 <0.001 90.4% <0.001
 Case-control 4 0.78 0.65–0.94 <0.001 0% 0.526
Cancer location
 Colon 6 0.68 0.55–0.83 <0.001 86.2% <0.001
 Rectum 5 0.89 0.83–0.95 <0.001 0 0.887
Geographical region
 America 3 0.58 0.46–0.74 <0.001 0 0.957
 Europe 6 0.82 0.74–0.90 <0.001 51% 0.070
 Asia 4 0.83 0.51–1.34 0.442 97% <0.001
  1. Abbreviations: N number of studies, RR relative risk, CI confidence intervals, P′ p value of I2 statistics for heterogeneity