Sensitivity analyses: results when given named study is omitted
| Study omitted | Risk ratio (95% CI) | Heterogeneity (I2) | P value |
| de Jager et al 17 | 1.63 (1.25 to 2.13) | 44% | <0.001 |
| Wang et al 11 | 1.47 (1.21 to 1.79) | 24% | <0.001 |
| Yu et al 13 | 1.59 (1.26 to 2.00) | 45% | <0.001 |
| Park et al 15 | 1.50 (1.25 to 1.79) | 24% | <0.001 |
| van Dijk et al 12 | 1.67 (1.26 to 2.21) | 38% | <0.001 |
| Schmidt et al 14 | 1.59 (1.27 to 1.99) | 44% | <0.001 |
| Meyer et al 16 | 1.64 (1.34 to 2.02) | 31% | <0.001 |
| Li et al 10 | 1.51 (1.26 to 1.81) | 25% | <0.001 |