Internal consistency and score distribution for each patient-reported outcome obtained on day 1 (on admission day due to acute exacerbation of COPD)
| Patient-reported outcomes | Possible score range | Items (n) | Cronbach’s alpha coefficient | Score distribution | ||||||
| Mean | SD | Median | Maximum | Minimum | Floor effect (%) | Ceiling effect (%) | ||||
| EXACT total score | 0–100 | 14 | 0.89 | 50.5 | 12.4 | 52.0 | 70.0 | 25.0 | 0.0 | 0.0 |
| Breathlessness domain score | 0–100 | 5 | 0.93 | 54.7 | 24.9 | 56.0 | 87.0 | 0.0 | 6.1 | 0.0 |
| Cough and sputum domain score | 0–100 | 2 | 0.65 | 38.8 | 21.8 | 39.0 | 86.0 | 0.0 | 6.1 | 0.0 |
| Chest symptoms domain score | 0–100 | 3 | 0.64 | 48.0 | 20.0 | 52.0 | 79.0 | 12.0 | 0.0 | 0.0 |
| CAT score | 0–40 | 8 | 0.85 | 24.4 | 8.5 | 25.0 | 40.0 | 5.0 | 0.0 | 3.0 |
| SGRQ total score | 0–100 | 50 | 0.93 | 55.1 | 19.8 | 57.0 | 88.0 | 6.5 | 0.0 | 0.0 |
| SGRQ symptoms | 0–100 | 8 | 0.78 | 66.7 | 20.8 | 65.8 | 100.0 | 6.3 | 0.0 | 6.5 |
| SGRQ activity | 0–100 | 16 | 0.89 | 67.7 | 25.9 | 79.2 | 100.0 | 0.0 | 3.2 | 6.5 |
| SGRQ impact | 0–100 | 26 | 0.87 | 44.2 | 22.2 | 45.2 | 88.0 | 0.0 | 3.2 | 0.0 |
| Hyland Scale score | 0–100 | 1 | NA | 42.6 | 20.7 | 50.0 | 80.0 | 0.0 | 3.2 | 0.0 |
| D-12 total score | 0–36 | 12 | 0.97 | 10.3 | 9.7 | 5.0 | 31.0 | 0.0 | 6.7 | 0.0 |
| D-12 physical score | 0–21 | 7 | 0.95 | 7.3 | 5.9 | 5.0 | 20.0 | 0.0 | 6.7 | 0.0 |
| D-12 affective score | 0–15 | 5 | 0.97 | 3.2 | 4.1 | 1.0 | 11.0 | 0.0 | 48.4 | 0.0 |
CAT, COPD Assessment Test; COPD, chronic obstructive pulmonary disease; D-12, Dyspnoea-12; EXACT, Exacerbations of Chronic Pulmonary Disease Tool; SGRQ, StGeorge’s Respiratory Questionnaire.