Table 2.

IVCS coefficients and standard error of the estimate (SEE) for polynomial curve fits for the three oximeters at each hematocrit level

Device	Hct level	Coefficient “C2”	Coefficient “C1”	Coefficient “B”	SEE (%)
Masimo radical	40	− 3.11E−03	1.29E+00	3.50E+00	0.35
	30	− 3.26E−03	1.31E+00	3.07E+00	0.36
	20	− 3.31E−03	1.34E+00	1.03E+00	0.66
	10	1.93E−03	3.93E−01	4.42E+01	0.44
Acare AH-M1	40	− 9.91E−03	2.44E+00	− 4.48E+01	0.51
	30	− 7.31E−03	2.06E+00	− 3.20E+01	0.40
	20	− 8.79E−03	2.36E+00	− 4.60E+01	0.40
	10	− 5.42E−03	1.95E+00	− 3.81E+01	3.74
CMS 50-DL	40	2.98E−03	3.34E−01	3.84E+01	1.26
	30	− 1.50E−03	1.04E+00	1.16E+01	0.94
	20	2.56E−03	3.40E−01	4.24E+01	1.20
	10	1.64E−03	3.69E−01	4.69E+01	1.00

Higher SEE values indicate greater variability and thus decreased precision