Table 2 Demographic and clinical characteristics of the external dataset
From: Predicting COPD 1-year mortality using prognostic predictors routinely measured in primary care
Characteristic | External set | Died | Not died | |||
|---|---|---|---|---|---|---|
N | % | N | % | N | % | |
Total | 4931 | 100 | 1424 | 28.9 | 3507 | 71.1 |
Mean age, years (SD) | 71.1 (11.0) | 75.0 (9.0) | 68.3 (11.1) | |||
Gender (males) | 2718 | 55.1 | 912 | 64 | 1806 | 51.5 |
Mean BMI, kg/m2 (SD) | 26.9 (6.5) | 25.2 (6.2) | 27.7 (6.4) | |||
Mean FEV1, L (SD) | 1.52 (0.70) | 1.34 (0.61) | 1.73 (0.70) | |||
MRC score | ||||||
 1 | 2433 | 49.3 | 478 | 33.6 | 1955 | 55.8 |
 2 | 1224 | 24.8 | 373 | 26.2 | 851 | 24.3 |
 3 | 926 | 18.8 | 387 | 27.2 | 539 | 15.4 |
 4 | 348 | 7.1 | 186 | 13.1 | 162 | 4.6 |
Smoking status | ||||||
 Ex-smoker | 2657 | 53.9 | 793 | 55.7 | 1864 | 53.1 |
 Current | 2274 | 46.1 | 631 | 44.3 | 1643 | 46.9 |
Hospitalised exacerbations | ||||||
 1–2 | 224 | 4.5 | 102 | 1.2 | 122 | 3.5 |
 > 2 | 9 | 0.2 | 7 | 0.5 | < 5 | . |
Comorbidities | ||||||
 Stroke | 368 | 7.5 | 144 | 10.1 | 224 | 6.4 |
 Asthma | 2452 | 49.7 | 736 | 51.7 | 1716 | 48.9 |
 Hypertension |  |  |  |  |  |  |
 Atrial fibrillation (COTE) | 731 | 14.8 | 330 | 23.2 | 401 | 11.4 |
 Chronic kidney disease | 733 | 14.9 | 340 | 23.9 | 393 | 11.2 |
 Dementia | 210 | 4.3 | 76 | 5.3 | 134 | 3.8 |
 Lung cancer (COTE) | 80 | 1.6 | 50 | 3.5 | 30 | 0.9 |
 Pulmonary fibrosis (COTE) | 80 | 1.6 | 33 | 2.3 | 47 | 1.3 |
Blood tests | ||||||
 Low albumin, g/L | 369 | 7.5 | 153 | 10.7 | 216 | 6.2 |
 Hb, g/dL mean (SD) | 141.1 (67.7) | 143.6 (102.0) | 140.0 (47.1) | |||
 Low platelets, × 109/L | 211 | 4.3 | 142 | 4.1 | 69 | 4.9 |
 High platelets, × 109/L | 398 | 8.1 | 138 | 9.7 | 260 | 7.4 |
 Creatinine, μmol/L mean (SD) | 94.1 (45.4) | 105 (52.5) | 89.4 (41.3) | |||