Table 2.
Meta-analyses on the associations between night-shift work and each type of cancers.
| Types of cancers | N | OR | 95% CI | Heterogeneity (I2, %) |
|---|---|---|---|---|
| Breast cancer | 26 | 1.009 | (0.984, 1.033) | 45.7 |
| Prostate cancer | 12 | 1.027 | (0.982, 1.071) | 52.3 |
| Ovarian cancer | 8 | 1.027 | (0.942, 1.113) | 33.3 |
| Pancreatic cancer | 6 | 1.007 | (0.910, 1.104) | 3.2 |
| Colorectal cancer | 6 | 1.016 | (0.964, 1.068) | 52.2 |
| Lung cancer | 6 | 0.949 | (0.903, 0.996) | 52 |
| Non-Hodgkin's lymph | 5 | 1.046 | (0.994, 1.098) | 30.5 |
| Stomach cancer | 4 | 1.064 | (0.971, 1.157) | 0 |
| Skin cancer | 4 | 0.916 | (0.879, 0.953) | 29.4 |
| Urinary organs | 3 | 1.091 | (1.019, 1.163) | 0 |
| Esophagus cancer | 3 | 0.812 | (0.616, 1.008) | 32.1 |
| Leukemia | 3 | 0.983 | (0.838, 1.127) | 0 |
| Uterus cancer | 2 | 0.984 | (0.844, 1.123) | 31.9 |
| Oral cancer | 2 | 0.897 | (0.717, 1.077) | 0 |
| Larynx cancer | 2 | 1.003 | (0.784, 1.222) | 0 |
| Testis cancer | 2 | 0.9 | (0.636, 1.164) | 0 |
OR, odds ratio; CI, confidence interval; N, number of included studies.