Comparison of infants that exhaled through the CPAP system in either interface and those who did not
| Exhaled through either interface (mask or prongs) n=32 | Did not exhale via CPAP n=18 | P value | |
| GA birth, w+d (median, IQR) | 34+0 (31+5–39+2) | 32+4 (28+3–35+5) | 0.182 |
| PMA, days (median, IQR) | 34+0 (31+6–39+3) | 33+3 (32+1–36+0) | 0.701 |
| Postnatal age (median, IQR) | 1 (0–2.8) | 2.5 (1-8) | 0.029 |
| Weight, g (median, IQR) | 2011 (1536–3485) | 1734 (1275–2575) | 0.249 |
| CPAP duration, hours (median, IQR) | 20 (8–67) | 60 (16–336) | 0.018 |
| CPAP level, cmH20 (median, IQR) | 4 (4–4) | 4 (4–5) | 0.299 |
Mann-Whitney U test used for comparisons.
CPAP, continuous positive airway pressure; GA, gestational age; PMA, postmenstrual age.