Table 2.
Group | Number of studies | RR (95% CI) | P (heterogeneity) | I 2 (%) |
---|---|---|---|---|
Total | 6 | 0.96 [0.86, 1.06] | 0.42 | 38 |
Geographic area | ||||
North America | 1 | 0.83 [0.65, 1.06] | / | / |
Asia | 3 | 1.03 [0.83, 1.29] | 0.76 | 53 |
Europe | 2 | 0.96 [0.80, 1.16] | 0.69 | 62 |
Number of participates | ||||
<30,000 | 3 | 0.93 [0.80, 1.07] | 0.31 | 44 |
≥30,000 | 4 | 1.03 [0.83, 1.29] | 0.76 | 53 |
Sex | ||||
Men | 2 | 0.91 [0.77, 1.07] | 0.25 | 0 |
Women | 1 | 0.72 [0.50, 1.05] | / | / |