Mean (SD) characteristics of the study population
| Total (n=284) | Boys (n=154) | Girls (n=130) | p Value | |
| Age (years) | 4.95 (0.84) (range 3.0–6.4) | 4.99 (0.86) | 4.92 (0.81) | 0.480 |
| Height (cm) | 111.77 (6.58) (range 94–130) | 112.10 (6.52) | 111.38 (6.65) | 0.357 |
| Weight (kg) | 19.90 (3.49) (range 14–36) | 20.06 (3.54) | 19.71 (3.44) | 0.411 |
| Rinti(kPa/l.s) | 0.744 (0.21) (n=282) | 0.728 (0.196) (n=153) | 0.763 (0.227) (n=129) | 0.164 |
| Rinte (kPa/l.s) | 0.725 (0.22) (n=279) | 0.716 (0.217) (n=151) | 0.735 (0.224) (n=128) | 0.456 |
Rinti, Rinte = inspiratory and expiratory interrupter respiratory resistance.