Characteristics of the 696 patients included in the final study analysis
| Algorithm | COPD Code+spirometry+COPD medication | COPD Code+spirometry | COPD Code+COPD medication | COPD Code only | Bronchitis+COPD medication | Bronchitis only | Symptoms+spirometry | Symptoms only |
|---|---|---|---|---|---|---|---|---|
| Number of individuals (%) | 85 (100) | 79 (100) | 88 (100) | 89 (100) | 98 (100) | 84 (100) | 83 (100) | 90 (100) |
| Number (%) with supporting info | 46 (54.1) | 44 (55.7) | 48 (54.5) | 40 (44.9) | 32 (32.7) | 18 (21.4) | 30 (36.1) | 14 (15.6) |
| Mean age (SD) | 68.7 (11.3) | 68.3 (11.7) | 71.8 (10.5) | 71.1 (10.4) | 68.5 (13.1) | 67.8 (13.4) | 65.9 (11.9) | 63.4 (14.1) |
| Male (%) | 45 (52.9) | 41 (51.9) | 40 (45.5) | 44 (49.4) | 31 (31.6) | 29 (34.5) | 43 (51.8) | 47 (52.2) |
| Current smoker (%) | 49 (57.7) | 50 (63.3) | 55 (62.5) | 47 (52.8) | 66 (67.4) | 61 (72.6) | 48 (57.8) | 58 (64.4) |
| GOLD stage (n=465)* | ||||||||
| 1 | 13 (16.3) | 14 (18.0) | 13 (15.9) | 16 (20.5) | 17 (28.8) | 13 (35.1) | 8 (20.0) | 4 (36.4) |
| 2 | 43 (53.8) | 48 (61.5) | 41 (50.0) | 46 (59.0) | 31(52.5) | 13 (35.1) | 22 (55.0) | 5 (45.5) |
| 3 | 18 (22.5) | 13 (16.7) | 22 (26.8) | 12 (15.4) | 9 (15.3) | 8 (21.6) | 8 (20.0) | 2 (18.2) |
| 4 | 6 (7.5) | 3 (3.9) | 6 (7.3) | 4 (5.1) | 2 (3.4) | 3 (8.1) | 2 (5.0) | 0 (0.0) |
| History of cardiovascular disease | 20 (23.5) | 22 (27.8) | 17 (19.3) | 18 (20.2) | 20 (20.4) | 17 (20.2) | 14 (16.9) | 9 (10.0) |
| History of asthma | 18 (21.2) | 20 (25.3) | 16 (18.2) | 15 (16.9) | 27 (27.6) | 23 (27.4) | 19 (22.9) | 23 (25.6) |
| Mean BMI (SD) (n=575) | N=83 27.5 (5.4) | N=78 26.7 (5.8) | N=86 26.4 (4.7) | N=87 27.8 (5.4) | N=98 27.4 (5.1) | N=85 28.1 (5.0) | N=41 27.1 (4.5) | N=17 27.6 (4.7) |
*GOLD staging was ascertained from CPRD records or from supplementary information provided by GPs.
BMI, body mass index; COPD, chronic obstructive pulmonary disease; CPRD, Clinical Practice Research Datalink; GOLD, Global initiative for Chronic Obstructive Lung Disease; GP, general practitioner.