Predictive factors for an acute exacerbation of chronic obstructive pulmonary disease(AECOPD), having at least one versus no exacerbations during the 6-month follow-up
| Factor | Adjusted OR (95% CI) | p-value |
| Age# | 0.98 (0.96–1.00) | 0.077 |
| Dyspnoea¶ | 1.35 (1.06–1.74) | 0.017 |
| AECOPD+ in the past 3 yrs n | 1.14 (1.06–1.23) | 0.0008 |
| Pulmonary rehabilitation§ | 0.32 (0.15–0.66) | 0.0021 |
OR: odds ratio; CI: confidence interval. #: per increase in age; ¶: per increase in Medical Research Council dyspnoea scale; +: per increase in exacerbation; §: difference for patients who did not take part in a rehabilitation programme compared with those who did.