| RSV group(n = 14) | Non-RSV group(n = 63) | p Value | |
| Gestational age (weeks) | 26 (24–31) | 28 (24–31) | 0.335 |
| Birth weight (g) | 820 (650–1826) | 964 (515–1520) | 0.353 |
| Maternal steroids (%) | 85 | 82 | 1.000 |
| Surfactant (%) | 86 | 81 | 1.000 |
| IPPV (%) | 100 | 97 | 1.000 |
| CPAP (%) | 86 | 68 | 0.324 |
| HFOV (%) | 8 | 5 | 0.563 |
| Nitric oxide (%) | 7 | 7 | 1.000 |
| PDA (%) | 29 | 37 | 0.759 |
| Air leak (%) | 14 | 14 | 1.000 |
| Postnatal dexamethasone (%) | 36 | 38 | 0.890 |
| At lung function | |||
| Age (years) | 10.5 (8.9–12.1) | 10.3 (8.5–11.9) | 0.460 |
| Height (cm) | 135 (119–151) | 139 (122–160) | 0.488 |
| Weight (kg) | 29.7 (18.6–39.4) | 32.5 (20.4–65.0) | 0.074 |
| PEF* | 67.8 (27.1–99.3) | 76 (27–140) | 0.102 |
| FVC* | 89.6 (75–125) | 94.2 (68.7–125) | 0.240 |
| FEV0.75* | 68.2 (48–99) | 81.9 (47–133) | 0.015 |
| FEV0.75/FVC | 78.9 (52.9–97.1) | 86.4 (58–116.2) | 0.027 |
| FEF25* | 67.0 (32–94) | 75.4 (27.7–131) | 0.362 |
| FEF50* | 50.7 (22.5–93) | 70.1 (22–165) | 0.034 |
| FEF75* | 40.7 (24–60) | 57.2 (11–221) | 0.006 |
*Results are expressed as percentage predicted for height.
CPAP, continuous positive airway pressure; FEF, forced expiratory flow; FEF25, flow at 25% of vital capacity; FEF50, flow at 50% of vital capacity; FEF75, flow at 75% of vital capacity; FEV, forced expiratory volume; FVC, forced vital capacity; HFOV, high frequency oscillatory ventilation; IPPV, intermittent positive pressure ventilation; PDA, patent ductus arteriosus; PEF, peak expiratory flow; RSV, respiratory syncytial virus.