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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)