Table 2.

Pulse oximeter bias (mean SpO₂ - SaO₂) (%) in different subgroups of patients.

Parameter	Subgroup	n	Bias (%)	p	Limits of Agreement
SaO2	<90	27	4.92	0.004	-2.2 to 12.0
	≥ 90	67	1.89		-2.9 to 6.7
Lactate	>2	52	2.58	0.40	-4.2 to 9.3
	≤ 2	35	3.14		-1.9 to 8.1
	>4	25	2.52	0.67	-6.2 to 11.2
	≤ 4	62	2.92		-1.8 to 7.8
pH	<7.35	43	3.15	0.30	-4.6 to 10.9
	≥ 7.35	51	2.43		-2.1 to 6.9
Hemoglobin	<136	46	3.00	0.42	-4.1 to 10.1
	≥ 136	42	2.48		-2.4 to 7.4
	<119	22	3.41	0.38	-5.3 to 12.2
	≥ 119	66	2.53		-2.5 to 7.6
Blood culture	Positive	29	3.66	0.06	-3.8 to 11.1
	Negative	47	2.21		-3.3 to 7.7
Vasopressors	Yes	40	3.05	0.43	-4.8 to 10.9
	No	48	2.50		-1.8 to 6.8