did not reach statistical significanceP = 0.0667
pO 2 was lower, although it did not reach statistical significance, in percutaneous cricothyroidotomy, 2.0 (IQR 1.1–2.9) kPa, compared with surgical cricothyroidotomy, 7.0 (IQR 4.7–7.7) kPa ( P = 0.0667, Fig. 2 c).