Cohort demographics
| Derivation cohort, April 2015 – March 2017 | Validation cohort, April 2017 – March 2019 | |||||
|---|---|---|---|---|---|---|
| Respiratory (total) | Non-COPD (Scale 1) | COPD (Scale 2) | Respiratory (total) | Non-COPD (Scale 1) | COPD (Scale 2) | |
| Admissions, n | 7,269 | 5,165 | 2,104 | 8,485 | 6,351 | 2,381 |
| Women, n (%) | 3,953 (54.4) | 2,775 (53.7) | 1,178 (56.0) | 4,718 (54.0) | 3,402 (53.5) | 1,316 (55.3) |
| Age, years, median (IQR) | 71 (61–81) | 71 (61–81) | 71 (61–76) | 71 (56–76) | 66 (51–76) | 71 (61–76) |
| Length of stay, days, median (IQR) | 4 (2–8) | 4 (2–8) | 3 (2–7) | 3 (1–7) | 3 (1–7) | 3 (1–6) |
| In-hospital mortality, n (%) | 413 (5.7) | 328 (6.4) | 85 (4.0) | 470 (5.5) | 398 (6.5) | 72 (3.1) |
COPD = chronic obstructive pulmonary disease; IQR = interquartile range.