TABLE 1.
Characteristics of cohort participants with and without chronic bronchitis (CB)
| CB | No CB | p-value | |
| Subjects | 158 | 2361 | |
| Age years | 22.4±0.5 | 22.4±0.5 | 0.361 |
| Female | 85 (53.8) | 1278 (54.1) | 0.935 |
| BMI kg·m−2 | 24.03±4.4 | 23.15±3.8 | 0.005 |
| Education | 0.544 | ||
| Secondary school | 106 (67.1) | 1503 (63.8) | |
| High school | 34 (21.5) | 514 (21.8) | |
| University | 18 (11.4) | 340 (14.4) | |
| Smoking status | <0.001 | ||
| Never-smoker | 72 (45.6) | 1628 (69.1) | |
| Former smoker | 27 (17.1) | 289 (12.3) | |
| Current smoker, sometimes | 27 (17.1) | 297 (12.6) | |
| Current smoker, every day | 32 (20.3) | 142 (6.0) | |
| Cigarette consumption per day# | 4.3 (1.1–10.0) | 1.4 (0.4–5.0) | <0.001 |
| Electronic cigarette smoking | 11 (7.0) | 82 (3.5) | 0.025 |
Data are presented as n, mean±sd, n (%) or median (interquartile range), unless otherwise stated. BMI: body mass index. #: based on current smokers.