Histological type | Non-cases | ||||
Squamous cell carcinoma | Small cell carcinoma | Adenocarcinoma | Large cell carcinoma | ||
No of cases (1976–2002) | 201 | 236 | 543 | 82 | |
Current smoker before diagnosis | 115 (57) | 176 (75) | 285 (52) | 49 (60) | |
Former smoker before diagnosis | 86 (43) | 60 (25) | 258 (48) | 33 (40) | |
Age in 1976 (not standardised) | 47.2 | 46.7 | 46.8 | 45.9 | 42.3 |
Smoking status in 1976 (): | |||||
Former smoker, 1–2 years | 1.6 | 1.5 | 1.9 | 7.6 | 4.6 |
Former smoker, >2 years | 4.1 | 2.5 | 13.8 | 6.6 | 36.2 |
Current smoker | 94.2 | 96.0 | 84.1 | 85.8 | 57.5 |
Amount smoked in 1976 among current smokers (): | |||||
<15 cigarettes/day | 9.2 | 4.0 | 11.2 | 4.2 | 28.8 |
15–24 cigarettes/day | 43.2 | 43.5 | 41.5 | 42.3 | 44.1 |
25–34 cigarettes/day | 23.2 | 29.2 | 25.1 | 32.4 | 17.7 |
⩾35 cigarettes/day | 24.3 | 23.3 | 22.2 | 21.1 | 9.4 |
Age at start of smoking (mean) | 18.6 | 19.4 | 18.9 | 18.9 | 20.1 |
<15 years () | 7.4 | 2.3 | 4.4 | 8.4 | 2.4 |
15–19 years () | 54.7 | 52.2 | 60.9 | 42.2 | 54.0 |
⩾20 years () | 37.9 | 45.5 | 34.7 | 49.5 | 43.6 |
Duration of smoking (years) | 24.0 | 23.4 | 22.5 | 23.2 | 18.6 |
Pack-years of smoking (mean) | 31.3 | 32.4 | 28.7 | 32.2 | 18.1 |
Pack-years after age 30 (mean) | 23.8 | 24.6 | 21.1 | 23.1 | 12.0 |
*Values are standardised to the age distribution of the cohort (unless specified). A total of 105 cases occurred in never smokers and are not included in this table.