Fig. 1From: Predictive validity of a novel non-invasive estimation of effective shunt fraction in critically ill patientsa Boxplot showing distribution of absolute error for each measure in all samples, together with baseline distribution of pairs of ABGs in which FIO2 was unchanged (box shows mean +/ − one quartile, whiskers show range). b Range of possible FIO2-PaO2 combinations for conditions matching a single ABG result. c Range of possible results for conditions matching two ABG results at different FIO2Back to article page