Table 2.
Subgroup analyses of the relationship between shift work and prostate cancer.
| Subgroup Items | Number 1 | Pooled Results | Heterogeneity (I2), % | p-Value of Heterogeneity |
|---|---|---|---|---|
| Exposure variable | ||||
| Rotating shift work exclusively | 7 | 1.05 (1.00–1.10) | 0.0 | 0.460 |
| Night-fixed work exclusively | 3 | 1.81 (0.86–2.76) | 81.2 | 0.005 |
| Both | 6 | 1.01 (0.87–1.16) | 46.0 | 0.099 |
| Study design | ||||
| Cohort | 11 | 1.03 (0.96–1.10) | 18.9 | 0.264 |
| Case-control | 5 | 1.28 (0.98–1.58) | 68.7 | 0.007 |
| Study quality | ||||
| High | 4 | 0.99 (0.80–1.17) | 0.0 | 0.108 |
| Medium | 9 | 1.06 (0.99–1.12) | 31.3 | 0.331 |
| Low | 3 | 1.52 (0.87–2.18) | 69.5 | 0.008 |
| Region of the study | ||||
| Nordic European countries | 5 | 1.03 (0.98–1.08) | 0.0 | 0.431 |
| Central-Southern European countries | 5 | 1.02 (0.85–1.18) | 44.5 | 0.125 |
| Asian countries | 3 | 1.84 (1.01–2.67) | 0.0 | 0.771 |
| United States and Canada | 3 | 1.19 (0.97–1.41) | 75.4 | 0.007 |