Fig. 1

Intraoperative oxygenation illustrated by a box and whisker plot illustrating FIO₂ administered over first five ABGs. Boxes are drawn between 25th and 75th percentiles with the median represented by a line and the whiskers indicating the minimum and maximum values. b Scatter plot and linear relationship between FIO₂ and PaO₂ for each ABG. The continuous line represents the relationship between partial pressure of arterial oxygen recorded and the fraction of inspired oxygen delivered (r = 0.22, p ≤  0.001)