Relationship between smoking restriction policy and secondhand smoke (SHS) exposure at workplaces among non-smokers (n=1902) in China, 2004
| Variable | Exposed to SHS (%) | Unadjusted | Adjusted* | ||
| OR | 95% CI | OR | 95% CI | ||
| Policy | |||||
| Smoke free | 32.0 | 1.0 | Reference | 1.0 | Reference |
| Restricted | 62.3 | 3.5 | 1.9 to 6.4 | 2.3 | 1.1 to 4.7 |
| Unrestricted | 67.3 | 4.4 | 2.1 to 8.9 | 3.7 | 1.3 to 10.1 |
| Region | |||||
| Rural | 54.1 | 1.0 | Reference | 1.0 | Reference |
| Urban | 57.0 | 1.1 | 0.6 to 2.0 | 1.2 | 0.6 to 2.2 |
| Province | |||||
| Sichuan | 64.0 | 1.0 | Reference | 1.0 | Reference |
| Jiangxi | 76.1 | 1.8 | 1.0 to 3.2 | 1.4 | 0.7 to 2.6 |
| Henan | 41.5 | 0.4 | 0.2 to 0.8 | 0.5 | 0.2 to 1.1 |
| Age | |||||
| 20–39 | 53.6 | 1.0 | Reference | 1.0 | Reference |
| 40–69 | 58.9 | 1.2 | 0.8 to 1.9 | 1.0 | 0.6 to 1.7 |
| Gender | |||||
| Male | 53.2 | 1.0 | Reference | 1.0 | Reference |
| Female | 58.7 | 1.3 | 0.8 to 1.9 | 1.4 | 0.8 to 2.4 |
| Education | |||||
| Junior high school or below | 54.6 | 1.0 | Reference | 1.0 | Reference |
| Senior high school | 56.3 | 1.1 | 0.7 to 1.6 | 1.2 | 0.7 to 2.1 |
| College or above | 56.7 | 1.1 | 0.6 to 2.1 | 1.7 | 0.8 to 3.6 |
| Occupation | |||||
| Government official or scientific personnel | 63.8 | 1.0 | Reference | 1.0 | Reference |
| Health worker or teacher | 49.7 | 0.6 | 0.3 to 1.0 | 0.5 | 0.3 to 0.9 |
| Labourer or employee in service department | 55.1 | 0.7 | 0.4 to 1.2 | 0.7 | 0.4 to 1.4 |
↵* Adjusted for all the variables in this table.