Table 4.
Lung Cancer Risks Associated with Cumulative Occupational EC Exposure by Smoking Status in Men
| Cumulative EC exposure (μg/m3-years) | Never-Smokers |
Former Smokers |
Current Smokers |
||||||
|---|---|---|---|---|---|---|---|---|---|
| Cases | OR* | 95% CI | Cases | OR† | 95% CI | Cases | OR‡ | 95% CI | |
| Never | 256 | 1.0 | Referent | 1,868 | 1.0 | Referent | 3,436 | 1.0 | Referent |
| >0–22 | 66 | 1.40 | 1.03–1.88 | 624 | 1.11 | 0.98–1.26 | 994 | 1.04 | 0.92–1.18 |
| 23–70 | 41 | 0.94 | 0.65–1.33 | 656 | 1.23 | 1.09–1.40 | 1,161 | 1.01 | 0.90–1.14 |
| 71–178 | 55 | 1.17 | 0.85–1.60 | 764 | 1.33 | 1.18–1.50 | 1,294 | 1.15 | 1.03–1.29 |
| >178 | 72 | 1.41 | 1.04–1.88 | 875 | 1.47 | 1.31–1.65 | 1,443 | 1.40 | 1.24–1.57 |
| Test for trend, P value§ | — | 0.03 | — | — | <0.01 | — | — | <0.01 | — |
| P value excluding never exposed‖ | — | 0.11 | — | — | 0.08 | — | — | 0.05 | — |
For definition of abbreviations, see Table 2.
*
ORs adjusted for study, age group, and list A jobs.
†
ORs adjusted for study, age group, list A jobs, smoking pack-years [log(cigarette pack-years + 1)], and time since quitting smoking.
‡
ORs adjusted for study, age group, list A jobs, and smoking pack-years [log(cigarette pack-years + 1)].
§
Test for trend, P value obtained using the corresponding continuous exposure variable.
‖
Test for trend, P value obtained using the corresponding continuous exposure variable among exposed subjects only.