Table 3.
Subgroup meta-analyses on the associations between night-shift work and combined risk for cancers.
| Groups | N | OR | 95% CI | Heterogeneity (I2, %) |
|---|---|---|---|---|
| Types of night-shift work | ||||
| Fixed | 8 | 0.880 | (0.746, 1.014) | 0.0 |
| Rotating | 15 | 0.982 | (0.960, 1.004) | 41.6 |
| Study designs | ||||
| Cohort studies | 32 | 0.996 | (0982, 1.011) | 41.2 |
| Case-control studies | 21 | 1.176 | (1.122, 1.230) | 47.2 |
| Nest case-control studies | 4 | 0.960 | (0.887, 1.032) | 18.1 |
| Sex | ||||
| Women | 41 | 0.989 | (0.972, 1.006) | 46.7 |
| Men | 17 | 1.033 | (1.010, 1.055) | 53.1 |
| Occupation | ||||
| Nurses | 11 | 0.979 | (0.958, 1.001) | 40.8 |
| Textile workers | 2 | 0.885 | (0.826, 0.944) | 0.0 |
| Region | ||||
| Asia | 13 | 0.949 | (0.899, 0.998) | 39.4 |
| Europe | 26 | 1.019 | (1.000, 1.037) | 41.3 |
| North America | 16 | 0.999 | (0.978, 1.021) | 59.1 |
| Oceania | 2 | 1.140 | (0.957, 1.323) | 0.0 |
OR, odds ratio; CI, confidence interval; N, number of included studies.