Table 1. Baseline characteristics of the study population.
| Baseline characteristics | Male (N=270) | Female (N=297) | P value |
|---|---|---|---|
| Age (years) | 36.0 (23.8) | 34.7 (23.0) | 0.065 |
| Height (cm) | 170.0 (9.0) | 159.0 (7.0) | <0.001 |
| Weight (kg) | 69.0 (15.1) | 56.0 (12.0) | <0.001 |
| BMI (kg/m2) | 23.7 (4.4) | 21.9 (4.4) | <0.001 |
| FEV1 (L) | 3.88 (0.87) | 2.86 (0.55) | <0.001 |
| FEV1 z score | 0.28 (1.24) | 0.16 (1.16) | 0.213 |
| FVC (L) | 4.66 (0.99) | 3.34 (0.62) | <0.001 |
| FVC z score | 0.23 (1.31) | 0.17 (1.27) | 0.211 |
| FEV1/FVC | 0.83 (0.07) | 0.84 (0.07) | 0.002 |
| FEV1/FVC z score | –0.05 (1.10) | –0.05 (1.17) | 0.839 |
| MMEF (L/s) | 3.86 (1.51) | 2.95 (1.21) | <0.001 |
| MMEF z score | 0.12 (1.23) | 0.05 (1.26) | 0.461 |
Data are presented as median (interquartile range). BMI, body mass index; FEV1, forced expiratory volume in the first second; FVC, forced vital capacity; MMEF, maximum mid-expiratory flow.