Characteristics of cigarette smoking among current smokers at recruitment
| Cigarette smoking characteristics | Men | Women | |||||
|---|---|---|---|---|---|---|---|
| n | (%) | n | (%) | ||||
| Daily cigarette consumption (cigarettes/day) | |||||||
| 1–10 | 2638 | (34.1) | 102 | (78.5) | |||
| 11–20 | 4463 | (57.7) | 24 | (18.5) | |||
| ⩾21 | 640 | (8.3) | 4 | (3.1) | |||
| Duration of cigarette smoking (years) | |||||||
| 1–20 | 1397 | (18.0) | 45 | (34.6) | |||
| 21–30 | 2234 | (28.9) | 31 | (23.8) | |||
| ⩾31 | 4110 | (53.1) | 54 | (41.5) | |||
| Cumulative cigarette smoking3-150 | |||||||
| 1–20 | 3135 | (40.5) | 103 | (79.2) | |||
| 21–40 | 3377 | (43.6) | 22 | (16.9) | |||
| ⩾41 | 1229 | (53.1) | 5 | (3.8) | |||
| Age starting smoking (years) | |||||||
| <20 | 4063 | (52.5) | 39 | (30.0) | |||
| 20–24 | 1660 | (21.4) | 12 | (9.2) | |||
| ⩾25 | 2018 | (26.1) | 79 | (60.8) | |||
↵3-150 Cumulative cigarette smoking (pack-years) = duration of smoking (years) × average packs of cigarettes smoked per day.