Table 1 Population characteristics of subjects
From: Accuracy of the COPD diagnostic questionnaire as a screening tool in primary care
|  | AT RISK of COPD n = 111 | EXISTING COPD n = 30 | TOTAL n = 141 |
|---|---|---|---|
Age (years; mean ± SD) | 67 (11.4) | 71 (10.3) | 68 (11.2) |
Gender (% female) | 57 (51%) | 24 (80%) | 81 (57%) |
Body mass index (Kg/m2; mean ± SD) | 27.8 (5.2) | 28.2 (5.6) | 27.9 (5.3) |
Current smokers | 10 (9%) | 6 (20%) | 16 (11%) |
Former smokers | 101 (91%) | 18 (60%) | 119 (84%) |
Never smoked | 0 (0%) | 6 (20%) | 6 (4%) |
CDQ score (mean ± SD) | 18.9 (5.6) | 20.0 (5.5) | 19.1 (5.6) |
CDQ score ≥ 16.5 | 73 (66%) | 24 (80%) | 97 (69%) |
CDQ score ≥ 19.5 | 43 (39%) | 16 (53%) | 59 (42%) |
Post-bronchodilator FEV1/FVC (mean ± SD) | 0.78 (0.8) | 0.62 (0.1) | 0.74 (0.1) |
Post-bronchodilator FEV1 (mean ± SD) | 2.67 (0.8) | 1.63 (0.7) | 2.45 (0.9) |
Airway obstruction (FEV1/FVC ≤ 0.7) | 18 (16%) | 24 (80%) | 42 (30%) |
Frequency (%) | |||
 Current smokers | 3 (3%) | 6 (20%) | 9 (6%) |
 Former smokers | 15 (14%) | 14 (47%) | 29 (21%) |
 Never smoked | 0 (0%) | 4 (13%) | 4 (3%) |
GOLD Stage I | 9 (8%) | 4 (13%) | 13 (9%) |
GOLD Stage II | 9 (8%) | 17 (57%) | 26 (18%) |
GOLD Stage III | 0 (0%) | 2 (7%) | 2 (1%) |
GOLD Stage IV | 0 (0%) | 0 (0%) | 0 (0%) |
No obstruction Frequency (%) | 93 (84%) | 6 (20%) | 99 (70%) |
 Current smokers | 7 (6%) | 0 (0%) | 7 (5%) |
 Former smokers | 86 (77%) | 4 (13%) | 90 (64%) |
 Never smoked | 0 (0%) | 2 (7%) | 2 (1%) |