Anthropometrics and spirometric parameters of the analysed population
| Healthy | ILD | Asthma | COPD | Bronchiectasis | UAO | |
| Subjects, N | 567 | 274 | 781 | 688 | 109 | 40 |
| Females, n (%) | 300 (52.9) | 124 (45.3) | 441 (56.5) | 58 (8.4) | 66 (60.6) | 19 (47.5) |
| Age, years | 38.3±14.3 | 57.4±11.6 | 45.9±12.9 | 63.2±8.6 | 52.9±11.1 | 54.5±14.9 |
| Height, cm | 164.3±8.3 | 161.6±8.0 | 162.2±8.2 | 165.2±7.0 | 160.0±8.4 | 160.7±7.5 |
| Weight, kg | 62.9±11.1 | 64.8±10.9 | 63.7±12.5 | 62.7±11.5 | 58.0±12.1 | 61.7±10.7 |
| BMI, kg·m−2 | 23.2±3.1 | 24.7±3.3 | 24.1±3.7 | 22.9±3.6 | 22.5±3.7 | 23.8±3.3 |
| FEV1, L# | 3.32±0.72 | 2.15±0.64 | 2.39±0.83 | 1.5±0.64 | 1.93±0.74 | 2.11±0.85 |
| FEV1 z-score# | 0.291±0.914 | −1.766±1.664 | −1.784±1.902 | −4.12±1.796 | −2.506±1.942 | −2.034±2.34 |
| FVC, L# | 3.96±0.87 | 2.71±0.84 | 3.52±0.95 | 3.02±0.80 | 2.84±0.86 | 3.22±0.84 |
| FVC z-score# | 0.310±0.978 | −1.800±1.753 | −0.225±1.442 | −1.517±1.690 | −1.363±1.482 | −0.407±1.526 |
| FEV1/FVC# | 83.8±5.5 | 80.1±8.7 | 67.2±13.0 | 48.5±12.8 | 67.2±14.1 | 64.2±16.0 |
| FEV1/FVC z-score# | −0.047±0.791 | 0.01±1.507 | −2.572±2.16 | −4.849±2.047 | −2.329±2.382 | −2.882±2.948 |
| MMEF, L·s−1¶ | 3.45±1.06 | 1.89±0.88 | 1.63±0.97 | 0.59±0.39 | 1.21±0.89 | 1.76±0.82 |
| MMEF z-score¶ | 0.153±0.993 | −0.904±1.347 | −1.917±1.172 | −2.901±0.552 | −2.094±1.304 | −1.399±1.067 |
| PEF, L·s−1# | 8.02±1.93 | 5.12±2.19 | 6.08±1.98 | 4.00±2.21 | 7.03±1.94 | 4.08±2.27 |
| PEF z-score# | 0.378±0.995 | −1.212±1.537 | −2.653±1.311 | −0.233±1.349 | −1.623±1.464 | −2.658±1.661 |
Data are presented as mean±sd unless otherwise stated. ILD: interstitial lung disease; UAO: upper airway obstruction; BMI: body mass index; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; MMEF: maximum mid-expiratory flow; PEF: peak expiratory flow. #: 11 data were missing from this analysis; ¶: 177 data were missing from this analysis.