Table 4 The summary of subgroup analyses results
Subgroup analysis | Studies (n) | Participants (n) | RR (95% CI) | I 2(%) | P heterogeneity | P value |
|---|---|---|---|---|---|---|
Prospective | 5 | 826 | 0.63 (0.48-0.83) | 0.00 | 0.7 | 0.001 |
Consecutive | 4 | 624 | 0.56 (0.37-0.83) | 0.00 | 0.7 | 0.005 |
Follow-up | 6 | 924 | 0.66 (0.51-0.85) | 0.00 | 0.8 | 0.002 |