Table 4.

Blood gas estimation performance on derivation and validation datasets before and after abstention.

	Derivation		Validation
	Before abstention	After abstention	Before abstention	After abstention
pH 95% percentile (± pH units)
All	0.103	0.092	0.086	0.078
< 7.3	0.114	0.096	0.102	0.083
7.3–7.45	0.103	0.094	0.081	0.075
≥ 7.45	0.089	0.076	0.096	0.083
PCO2 95% percentile (± mmHg)
All	10.33	8.78	9.67	8.72
20–35	9.65	7.82	9.33	7.82
35–60	9.45	8.43	9.08	8.52
60–120	17.43	13.78	17.95	13.48