Multivariate analysis of SGRQ-improved versus Non-improved patients with airway obstruction defined by FEV1/FVC<0.7
| Variable | OR | 95% CI | p Value |
|---|---|---|---|
| TDS score | 1.64 | 1.16 to 2.44 | 0.005 |
| Changes in exhaled CO, ppm | 0.90 | 0.82 to 0.99 | 0.012 |
| Baseline FEV1, % predicted | 0.99 | 0.93 to 1.05 | 0.712 |
| Baseline FVC, % predicted | 0.99 | 0.93 to 1.05 | 0.772 |
| Quitter | 0.26 | 0.07 to 0.85 | 0.026 |
| COPD | 1.85 | 0.53 to 6.72 | 0.335 |
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.