Comparisons of baseline characteristics between quitters and continuous smokers
| Variables | Quitters n=183 | Continuous smokers n=94 | p Value |
|---|---|---|---|
| Male sex | 122 (66.7) | 58 (61.7) | 0.414 |
| Age, year | 62.9±11.5 | 57.2±12.6 | <0.001 |
| Cigarettes smoked daily, N | 21.9±11.1 | 24.9±14.3 | 0.059 |
| Duration of smoking, year | 40.4±12.8 | 34.9±12.8 | <0.001 |
| Brinkman Index | 889.6±580.1 | 850.3±545.4 | 0.586 |
| TDS score | 7.7±1.6 | 7.8±1.6 | 0.569 |
| Exhaled CO, ppm | 11.6±8.1 | 18.2±10.3 | <0.001 |
| Body mass index, kg/m2 | 23.3±4.2 | 23.0±5.0 | 0.579 |
| FEV1, % predicted | 74.9±19.9 | 77.3±20.9 | 0.360 |
| FVC, % predicted | 82.1±18.2 | 84.4±15.6 | 0.291 |
| FEV1/FVC, % | 73.7±12.9 | 74.6±14.1 | 0.623 |
| Diseases (self-reported) | |||
| Mental disorder | 40 (21.9) | 39 (41.5) | <0.001 |
| Diabetes mellitus | 34 (18.6) | 15 (16.0) | 0.586 |
| Cardiovascular disease | 45 (24.6) | 15 (16.0) | 0.092 |
| COPD | 30 (16.4) | 19 (20.2) | 0.430 |
| Bronchial asthma | 24 (13.1) | 10 (10.6) | 0.548 |
| Cancer | 15 (8.2) | 7 (7.5) | 0.826 |
| SGRQ score | |||
| Symptoms | 41.4±23.9 | 42.4±24.7 | 0.734 |
| Activity | 34.8±25.6 | 37.2±27.6 | 0.478 |
| Impact | 19.3±18.2 | 22.4±18.4 | 0.187 |
| Total | 27.7±19.0 | 30.2±19.8 | 0.304 |
Data are presented as number (%) or mean±SD.
COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; SGRQ, St. George's Respiratory Questionnaire; TDS, Tobacco Dependence Screener test.