Table 3 Comparison of smoking exposure measures between cases and controls, stratified by sex
From: Brain tumours and cigarette smoking: analysis of the INTERPHONE Canada case–control study
Smoking exposure | Glioma cases | Meningioma cases | Controls |
|---|---|---|---|
Males | N = 105 | N = 26 | N = 317 |
Ever regular smokers, % | 61.0 | 65.4 | 55.8 |
Current smokers, % | 26.7 | 46.2 | 24.6 |
Ex-smokers, % | 34.3 | 19.2 | 31.2 |
Smokers only | N = 64 | N = 17 | N = 177 |
Cig/day, mean (sd) | 20.4 (13.8) | 20.5 (12.4) | 19.7 (12.8) |
Duration, mean years (sd) | 18.9 (11.1) | 21.7 (11.5) | 20.6 (11.4) |
Pack-years, mean (sd) | 21.9 (21.4) | 21.9 (17.0) | 21.9 (19.8) |
Females | N = 61 | N = 67 | N = 331 |
Ever regular smokers, % | 39.3 | 50.7 | 48.3 |
Current smokers, % | 19.7 | 20.9 | 19.9 |
Ex-smokers, % | 19.7 | 29.9 | 28.4 |
Smokers only | N = 24 | N = 34 | N = 160 |
Cig/day, mean (sd) | 17.2 (10.1) | 18.8 (13.2) | 15.6 (11.7) |
Duration, mean years (sd) | 18.9 (10.3) | 20.1 (10.8) | 18.7 (11.2) |
Pack-years, mean (sd) | 18.5 (18.3) | 20.9 (18.5) | 16.2 (16.6) |