Table 1.
Characteristics of the children.
| Control | Preterm | p | |
|---|---|---|---|
| n (M/F) | 27 (9/18) | 46 (19/27) | |
| Age (year) | 7.0 ± 0.5 | 7.2 ± 0.4 | 0.14 |
| Height (cm) | 121.8 ± 5.9 | 119.8 ± 5.7 | 0.17 |
| Weight (kg) | 24.3 ± 3.5 | 22.5 ± 3.3 | 0.026 |
| GA (week) | 39.7 ± 1.2 | 28.9 ± 1.8 | 0.000 |
| BW (kg) | 3.26 ± 0.42 | 1.19 ± 0.34 | 0.000 |
| Surfactant (n) | 28 | ||
| MV (day) | 28 ± 29 | ||
| O2 (day) | 42 ± 73 | ||
| CLD (n) | 7 | ||
| Pregnancy smoking | 3/25 | 11/27 | 0.02 |
| Current smoking | 5/27 | 18/45 | 0.06 |
| FVC-Z | 0.43 ± 0.79 | 0.2 ± 1.19 | 0.37 |
| FEV1-Z | 0.84 ± 0.95 | 0.27 ± 1.05 | 0.022 |
| MMEF-Z | 0.16 ± 0.93 | -0.6 ± 1.1 | 0.004 |
| FEV1/FVC | 0.94 ± 0.04 | 0.91 ± 0.08 | 0.08 |
| RV/TLC | - | 0.23 ± 0.09* | |
| MEF50/FVC | 1.35 ± 0.83 | 1.16 ± 0.40 | 0.018 |
GA, gestational age; BW, birth weight; MV, mechanical ventilation; CLD, chronic lung disease; FVC, forced vital capacity; FEV1, forced expiratory volume in 1s; MMEF, maximum mid-expiratory flow; RV, residual volume; TLC, total lung capacity; MEF50, maximum expiratory flow at 50% FVC. ∗n = 43.