Table 4.
Body mass index in relation to incidence of lung cancer, stratified by smoking status
| No. of Cases | Person-years | Multivariablea | ||
|---|---|---|---|---|
| HR | (95% CI) | |||
| Never smokers | ||||
| Body mass index | ||||
| <18.5 | 1 | 9,168 | 1.73 | (0.23–13.19) |
| 18.5–24.9 | 17 | 201,281 | 1.00 | |
| 25.0–29.9 | 12 | 151,545 | 0.64 | (0.30–1.36) |
| 30+ | 16 | 142,693 | 0.83 | (0.41–1.70) |
| p for trend | 0.23 | |||
| Former smokers | ||||
| Body mass index | ||||
| <18.5 | 4 | 1,479 | 8.70 | (2.87–26.40) |
| 18.5–24.9 | 32 | 51,442 | 1.00 | |
| 25.0–29.9 | 56 | 61,107 | 0.98 | (0.63–1.52) |
| 30+ | 48 | 61,390 | 0.90 | (0.56–1.42) |
| p for trend | 0.06 | |||
| Current smokers | ||||
| Body mass index | ||||
| <18.5 | 4 | 2,095 | 1.56 | (0.55–4.42) |
| 18.5–24.9 | 52 | 37,976 | 1.00 | |
| 25.0–29.9 | 54 | 37,283 | 0.93 | (0.63–1.37) |
| 30+ | 27 | 31,651 | 0.62 | (0.38–1.00) |
| p for trend | <0.01 | |||
a
Adjusted for age, education, physical activity, alcohol consumption, parity, age at first birth, family history of lung cancer, and geographic region. Models for former smokers and current smokers were additionally adjusted for pack-years of smoking.