Table 3. Airway resistance and spirometry values in both groups of children.
| Preterm (n=112) Mean±SD |
Full-term (n=112) Mean±SD |
p-value* | |
|---|---|---|---|
| Rint (KPa/L) | 0.67±0.43 | 0.47±0.15 | 0.001 |
| % Expected | 110.3±73.3 | 59.5±5.4 | <0.001 |
| Z score | 0.13±2.24 | -1.02±1.29 | <0.001 |
| FVC (L) | 1.63±0.37 | 1.69±0.31 | 0.573 |
| % Expected | 95.4±14.8 | 98.4±11.9 | 0.279 |
| Z score | -0.39±1.27 | -0.15±1.03 | 0.106 |
| FEV1/FVC | 87.85±6.91 | 90.00±6.40 | 0.013 |
| % Expected | 97.7±7.7 | 100.1±6.9 | 0.017 |
| Z score | -0.23±1.22 | 0.14±1.11 | 0.003 |
| FEV1 (L) | 1.43±0.32 | 1.52±0.27 | 0.655 |
| % Expected | 93.6±16.0 | 98.8±13.1 | 0.008 |
| Z score | -0.48±1.29 | -0.04±1.08 | 0.071 |
| FEF25-75 (L/min) | 1.62±0.53 | 1.90±0.50 | 0.001 |
| % Expected | 86.0±25.6 | 97.4±22.2 | <0.001 |
| Z score | 1.16±1.37 | 2.08±1.26 | 0.005 |
SD: standard deviation; *Mann-Whitney’s test; Rint: airway resistance; FVC: forced vital capacity; FEV1: forced expiratory volume in one second; FEF25-75: forced expiratory flow between 25% and 75% of vital capacity