| Males (median (5–95% centile)) | Females (median (5–95% centile)) | |
| n | 498 | 474 |
| FEV1 (l) | 3.75 (2.57–4.84) | 2.71 (1.96–3.61) |
| FVC (l) | 4.92 (3.61–6.33) | 3.48 (2.60–4.57) |
| FER (%) | 77.0 (65–85) | 78.0 (68–85.3) |
| Height (m) | 1.75 (1.64–1.87) | 1.62 (1.52–1.71) |
| Weight (kg) | 83.0 (66–109) | 69.0 (53.8–92.3) |
| BMI (kg/m2) | 27 (22.5–34.6) | 26 (20.9–36) |
| Age (y) | 57.0 (47–70) | 57.0 (47–70) |
| Haemoglobin | 15.2 (13.7–16.9) | 13.7 (12.1–15.5) |
| Tlco (mmol/min/kPa) | 9.17 (6.80–12.0) | 6.63 (4.97–8.61) |
| Va (l) | 6.71 (5.06–8.29) | 4.88 (3.82–6.09) |
BMI, body mass index; FER, forced expired ratio; FEV1, forced expired volume in 1 s; FVC, forced vital capacity; Tlco, carbon monoxide transfer factor; Va, alveolar volume.