| Patient group | Mean pH (SD) | Mean pCO2 (SD) |
| Failed CPAP (n = 5) | 7.14 (0.19) | 11.68 (5.2) |
| Didn’t fail CPAP (n = 25) | 7.27 (0.07) | 8.86 (1.9) |
| p Value | 0.015 | 0.037 |
Median duration of nasal CPAP before intubation was 7.5 h (range 1.5–38).
CPAP, continuous positive airways pressure.