Non-smoking | Smoking | |
Control cohort | 1.00 | 6.03 (0.75 to 48.21) |
Asbestos cohort | 7.52 (0.90 to 62.79) | 17.35 (2.38 to 126.57) |
Synergy index | 1.4141 (0.734 to 3.987) | |
Low level† | 2.06 (0.13 to 33.17) | 10.71 (1.41 to 81.58) |
Medium level | 6.39 (0.40 to 102.17) | 18.43 (2.33 to 145.88) |
High level | 26.15 (2.91 to 234.88) | 28.58 (3.82 to 213.64) |
* HR and 95% CI using Cox model, adjusting for age at entry.
† Non-smoking controls served as reference group in comparison with asbestos workers in different exposure levels.