Table 1.
Characteristics of study sample by sex
| Characteristic | Males (n=2591) N (%) |
Females (n=2763) N (%) |
|---|---|---|
| Baseline age, years | ||
| 18–34 | 659 (25.4) | 1164 (42.1) |
| 35–45 | 898 (34.7) | 973 (35.2) |
| 46–70 | 1034 (39.9) | 626 (22.7) |
| Baseline smoking status | ||
| Never | 754 (29.1) | 2565 (92.8) |
| Former | 366 (14.1) | 87 (3.1) |
| Current | 1471 (56.8) | 111 (4.1) |
| Smoking quantity (among ever smokers) | ||
| Mean CPD ± SD | 12.2 ± 8.3 | 4.4 ± 4.2 |
| 1–5 | 923 (50.3) | 166 (84.3) |
| 6–9 | 223 (12.2) | 19 (9.6) |
| 11–20 | 486 (26.5) | 8 (4.1) |
| 21–30 | 170 (9.3) | 4 (2.0) |
| ≥31 | 32 (1.7) | 0 (0) |
| Age of smoking initiation (among ever smokers) | ||
| Mean age of smoking initiation ± SD | 19.1 ± 6.7 | 21.8 ± 10.3 |
| ≤18 | 1014 (55.3) | 89 (45.2) |
| 19–30 | 731 (39.9) | 74 (37.6) |
| ≥31 | 88 (4.8) | 34 (17.3) |
Abbreviations: cigarettes per day, CPD; standard deviation, SD.