| (B) Pack-years* (analysis among current smokers only) | ||||
| Cases* (n=231) | Controls* (n=284) | Age OR (95% CI) | aOR (95% CI) | |
| >30 pack-years | 103 (44.6) | 29 (10.2) | 7.6 (4.7 to 12.4) | 6.9 (3.7 to 12.8) |
| 10–30 pack-years | 17 (7.4) | 19 (6.7) | 2.3 (1.1 to 4.8) | 1.9 (0.8 to 4.7) |
| <10 pack-years | 8 (3.5) | 37 (13.0) | 0.6 (0.3 to 1.5) | 0.5 (0.2 to 1.6) |
| Non-smokers | 103 (44.6) | 199 (70.1) | 1.0 | 1.0 |
ORs were adjusted for age (age OR) and for age, sex, regular alcohol consumption, reported hypertension, hypercholesterolaemia, diabetes and BMI (aOR).
*Among current smokers, 18 cases and 20 controls did not specify the number of cigarettes smoked and so were left out of this analysis.
aOR, adjusted OR; BMI, body mass index.