Table 2.
The association between ETS and risk of lung cancer among never smokers in a population based case-control study, Greater Toronto Area, Ontario, 1997-2002
| Total Population n = 1393 | Never smokers n = 622 | |||||||
|---|---|---|---|---|---|---|---|---|
| Case, n | Control, n | ORa | 95%CI | Case, n | Control, n | ORb | 95%CI | |
| 445 | 948 | 156 | 466 | |||||
| ETS Exposure | ||||||||
| None | 29 | 88 | Refc | 23 | 68 | Refd | ||
| At home Adult and/or Child | 375 | 772 | 1.2 | 0.7-1.9 | 109 | 341 | 1.1 | 0.6-1.9 |
| Childhood | 333 | 672 | 1.1 | 0.7-1.9 | 93 | 298 | 1.0 | 0.6-1.8 |
| Adulthood | 226 | 439 | 1.0 | 0.6-1.7 | 50 | 247 | 1.0 | 0.5-2.0 |
| At work | 259 | 463 | 1.3 | 0.9-1.9 | 69 | 179 | 1.2 | 0.7-2.1 |
| < 10 years | 73 | 194 | 1.1 | 0.8-1.6 | 32 | 90 | 1.3 | 0.8-2.2 |
| > 10 years | 176 | 261 | 1.2 | 0.9-1.6 | 37 | 86 | 1.2 | 0.7-2.0 |
| At both home and work | 226 | 405 | 1.4 | 0.9-2.2 | 50 | 142 | 1.2 | 0.7-2.1 |
aOR is adjusted for pack-years of smoking, age, sex, education and ethnicity
bOR is adjusted for age, sex, education and ethnicity
cReference group consists of all participants with no ETS exposure
dReference group consists of never-smokers with no ETS exposure