| (n=109) | | (n=32) | |
Age (years) | 68.1 | 62.5–73.8 | 66.8 | 60.7–73.7 |
FEV1 (l) | 1.00 | 0.74–1.3 | 1.00 | 0.77–1.48 |
FEV1 (% predicted) | 38.2 | 27.0–50.0 | 36.0 | 24.7–50.2 |
FEV1 (% reversibility) | 5.2 | 0–12.8 | 6.9 | 0–14.1 |
FVC (l) | 2.51 | 1.86–2.94 | 2.60 | 2.00–2.90 |
FEV1/FVC (%) | 42.3 | 33.1–53.3 | 45.1 | 32.3–53.5 |
PEF (l/min) | 200 | 150–264 | 245 | 180–300 |
Pao2 (kPa) | 9.00 | 8.27–9.51 | 9.05 | 8.31–9.92 |
Paco2 (kPa) | 5.77 | 5.40–6.36 | 5.85 | 5.49–6.46 |
Smoking (years) | 40 | 30–50 | 40 | 30–46 |
| % of 109 | | % of 32 | |
Sex (male) | 74.3 | | 90.6 | |
Chronic dyspnoea | 45.0 | | 50.0 | |
Chronic wheeze | 33.0 | | 37.5 | |
Chronic cough | 49.5 | | 43.8 | |
Chronic sputum production | 56.0 | | 43.8 | |
Smoking at recruitment | 30.8 | | 31.2 | |
Taking inhaled steroids | 91.7 | | 87.5 | |