Multivariate analysis of SGRQ-improved versus non-improved among early quitters and continuous smokers
| Variable | OR | 95% CI | p Value |
|---|---|---|---|
| Age, year | 0.98 | 0.94 to 1.02 | 0.330 |
| Duration of smoking, year | 0.99 | 0.96 to 1.03 | 0.603 |
| TDS score | 1.39 | 1.17 to 1.66 | <0.001 |
| Baseline FEV1, % predicted | 0.98 | 0.96 to 1.01 | 0.134 |
| Baseline FVC, % predicted | 1.00 | 0.97 to 1.03 | 0.988 |
| Bronchial asthma | 1.35 | 0.55 to 3.39 | 0.508 |
FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; SGRQ, St. George's Respiratory Questionnaire; TDS, Tobacco Dependence Screener test.