| Variable | Hospital | ||
| Whole Cohort | Utilization Cohort | Ward Cohort | |
| N=405 | N=210 | N=118 | |
| Age, year, mean (SD) | 71.4 (11.5) | 71.8 (10.1) | 71.3 (10.3) |
| Sex, male, n (%) | 198 (48.9) | 104 (49.5) | 53 (44.9) |
| LOS ward, days, median (Q1-Q3) | 6.0 (4.0-9.0) | 6.0 (4.0-9.0) | 6.0 (4.0-11.0) |
| Reason for admission, n (%) | |||
| COPD | 278 (68.6) | 148 (70.5) | 80 (67.8) |
| COPD/pneumonia | 114 (28.1) | 56 (26.7) | 33 (28.0) |
| COPD/CHF | 13 (3.2) | 6 (2.9) | 5 (4.2) |
| COPD confirmed with spirometry, n (%) | |||
| Yes | 330 (81.5) | 169 (80.5) | 92 (78.0) |
| No | 3 (0.7) | 3 (1.4) | 2 (1.7) |
| Not available | 72 (17.8) | 38 (18.1) | 24 (20.3) |
| Post bronchodilator spirometry, mean (SD) | |||
| At admission | |||
| FEV1,% predicted | 32.3 (14.8) | 32.3 (14.4) | 32.7 (16.4) |
| FEV1/FVC,% | 49.1 (14.3) | 48.8 (14.8) | 50.3 (15.6) |
| At discharge | |||
| FEV1,% predicted | 35.6 (15.7) | 36.1 (16.5) | 37.1 (18.8) |
| FEV1/FVC,% | 47.5 (14.9) | 47.9 (15.5) | 50.9 (18.3) |
| Comorbidities, n (%) | |||
| Home oxygen | 67 (16.5) | 36 (17.1) | 27 (22.9) |
| Obstructive Sleep Apnea | 45 (11.1) | 29 (13.8) | 19 (16.1) |
| Hypercapnia | 19 (4.7) | 10 (4.8) | 8 (6.8) |
| Bronchiectasis | 30 (7.4) | 17 (8.1) | 12 (10.2) |
| Pulmonary Fibrosis | 1 (0.3) | 0 (0.0) | 0 (0.0) |
| Asthma | 24 (5.9) | 11 (5.2) | 4 (3.4) |