Logistic regression assessing potential risk factors for longer exacerbation recovery times
| OR (95% CI) | p Value | |
| Chronic sputum production (y/n) | 0.90 (0.67 to 1.21) | 0.502 |
| Current smoker (y/n) | 0.95 (0.68 to 1.33) | 0.772 |
| FEV1 % predicted (per 1%) | 1.00 (0.99 to 1.01) | 0.430 |
| Male sex | 1.28 (0.94 to 1.73) | 0.117 |
| Low BMI (<20 kg/m2) | 0.85 (0.50 to 1.44) | 0.537 |
| Overweight BMI (25–30 kg/m2) | 1.00 (0.71 to 1.42) | 0.996 |
| Obese BMI (≥30 kg/m2) | 1.13 (0.73 to 1.73) | 0.589 |
| History of cardiovascular disease (y/n) | 1.16 (0.85 to 1.60) | 0.350 |
| Age (per year) | 0.99 (0.97 to 1.01) | 0.438 |
| Winter season (Nov–Feb) | 1.40 (1.09 to 1.81) | 0.009 |
| Spring season (Mar–Apr) | 0.88 (0.65 to 1.18) | 0.384 |
| Summer season (May–Aug) | 1.10 (0.84 to 1.43) | 0.507 |
| Viral cold symptoms (0, 1 or 2) | 1.28 (1.10 to 1.50) | 0.001 |
| Sputum purulence (0, 1) | 0.92 (0.75 to 1.13) | 0.449 |
| Gradual onset of exacerbation (y/n) | 1.28 (1.06 to 1.54) | 0.010 |
BMI, body mass index; FEV1, forced expiratory volume in 1 s.