3.
不同类别分层非吸烟人群被动吸烟与肺癌的关系
Odds ratios (OR) and 95% confidence intervals (CI) of lung cancer among non-smokers associated with different categories
| Categories | References No. | Combined OR | 95%CI | Z | P |
| Amount of daily | |||||
| passive smoking | |||||
| < 20 cigarettes/day | 3, 5, 12, 13 | 1.49 | 0.88-2.51 | 3.11 | 0.14 |
| ≥20 cigarettes/day | 3, 5, 12, 13 | 1.78 | 1.30-2.43 | 3.61 | 0.000 3 |
| Life period passive | |||||
| smoking exposure | |||||
| Exposure in childhood | 5, 9, 15 | 1.42 | 0.97-2.08 | 3.87 | 0.08 |
| Exposure in adulthood | 5, 9, 15 | 1.50 | 1.23-1.83 | 4.00 | 0.000 1 |
| Gender | |||||
| Male | 4, 9, 10 | 1.36 | 0.93-2.00 | 1.58 | 0.11 |
| Female | 4, 5, 6, 7, 8, 9, 10 12, 14, 15, 16, 17 |
1.50 | 1.19-1.90 | 6.14 | 0.000 7 |
| Sources of passive smoke | |||||
| exposure | |||||
| Spouse | 6, 7, 8, 15 | 1.18 | 0.80-1.74 | 1.17 | 0.41 |
| Parents | 7, 8, 15 | 1.04 | 0.86-1.27 | 0.43 | 0.67 |
| Workplace | 7, 8, 14, 15, 16 | 1.41 | 1.19-1.66 | 4.00 | < 0.000 1 |