Multivariate adjusted risk factors of readmission to hospital for an exacerbation in a cohort of 312 patients with COPD (Cox regression)
| Adjusted HR (95% CI) | p value | |
|---|---|---|
| HR=hazard ratio; CI=confidence interval; FEV1=forced expiratory volume in 1 second. | ||
| *HR for “COPD admissions as a continuous variable” 1.19 (95% CI 1.10 to 1.30), p=0.000. | ||
| ⩾3 COPD admissions in the year before recruitment* | 1.66 (1.16 to 2.39) | 0.006 |
| % predicted FEV1 | 0.97 (0.96 to 0.99) | 0.001 |
| Po2(kPa) | 0.88 (0.79 to 0.98) | 0.024 |
| Controlled by a: | ||
| General practitioner | 1.00 | |
| Pulmonologist | 1.66 (0.98 to 2.80) | 0.058 |
| Anticholinergics | 1.81 (1.11 to 2.94) | 0.017 |
| Usual physical activity (in tertiles): | ||
| <79 kcal/day | 1.00 | |
| 79–232 kcal/day | 0.87 (0.60 to 1.27) | 0.469 |
| >232 kcal/day | 0.54 (0.34 to 0.86) | 0.010 |