Table 2.
Summary of the secondary outcomes, including the respiratory requirements and oxygen exposure in early life
| Ultrasound group (n = 29) |
Control group (n = 27) |
p | |
|---|---|---|---|
| FiO2 after surfactant (%) | 28 (25–30) | 35 (31–40) | < 0.001 |
| SpO2 after surfactant (%) | 93.5 (92–95) | 90 (90-90.8) | 0.001 |
| S/F after surfactant | 345 (290–381) | 285 (241–300) | 0.012 |
| MV | 5 (17.2%) | 10 (37.0%) | 0.095 |
| Duration of MV (days) | 2 (1–4.5) | 2 (1.8–4.3) | 0.523 |
| Ventilator-free days | 28 (28–28) | 28 (26–28) | 0.082 |
| NIV | 29 (100%) | 27 (100%) | 1.000 |
| Duration of NIV (days) | 3 (2–17) | 4 (3–22) | 0.428 |
| Duration of oxygen (days) | 6 (2–23.5) | 5.5 (3–22.8) | 0.926 |
| Length of stay in the NICU (days) | 47 (34–69) | 52 (38–68) | 0.780 |
| BPD | 3 (10.3%) | 3 (11.1%) | 1.000 |
Data are expressed as mean (standard deviation) or median (25th–75th percentile) and number (%) as appropriate. BPD bronchopulmonary dysplasia, MV invasive mechanical ventilation, NICU neonatal intensive care unit, NIV non-invasive mechanical ventilation, and S/F SpO2/FiO2 ratio