Characteristics of the Hordaland follow-up study cohort
| Males | Females | |
| Total | 1352 (48.0) | 1467 (52.0) |
| Age in 1985 yrs | ||
| 15–29 | 489 (36.2) | 491 (33.5) |
| 30–49 | 541 (40.0) | 573 (39.1) |
| 50–70 | 322 (23.8) | 403 (27.5) |
| Changes in smoking habits## | ||
| Never-to-never | 427 (32.9) | 631 (45.6) |
| Non-to-current | 67 (5.2) | 68 (4.9) |
| Current-to-current | 395 (30.4) | 381 (27.5) |
| Current-to-ex | 157 (12.1) | 136 (9.8) |
| Ex-to-ex | 253 (19.5) | 167 (12.1) |
| Pack-yrs¶¶ | ||
| 0 | 427 (32.9) | 631 (45.3) |
| 1–9 | 312 (24.1) | 392 (28.1) |
| 10–19 | 270 (20.8) | 226 (16.2) |
| 20+ | 287 (22.1) | 144 (10.3) |
Data are presented as n (%)
#: some subjects were not included in these categories due to lack of reporting of smoking, or inconsistencies
¶: not all subjects responded to questions about the number of cigarettes they smoked per day or the number of years they had smoked