Uncalibrated pulse power analysis fails to reliably measure cardiac output in patients undergoing coronary artery bypass surgery

Table 2 Bland-Altman analysis showing 95% limits of agreement, confidence interval and percentage error

	T1	T2	T3	T4
n _data /n _patient	n = 84/n = 42	n = 164/n = 42	n = 123/n = 42	n = 59/n = 40
	CI_PPnon-cal.	CI_PPcal.	CI_PPnon-cal.	CI_PPcal.
Mean (L/minute/m ² )	2.47	2.33	3.35	3.24
Bias (L/minute/m ² )	0.36	0.075	0.0078	0.0071
SD of bias (L/minute/m ² )	1.07	0.65	0.86	0.46
CI of LOA (L/minute/m ² )	0.56	0.34	0.45	0.24
95% Limits of agreement (L/minute/m ² )	-1.73 to +2.46	-1.19 to +1.34	-1.69 to +1.68	-0.89 to +0.91
Percentage error (%)	86	55	51	28

CI_PPnon-cal., cardiac index by uncalibrated pulse power analysis; CI_PPcal., cardiac index by calibrated pulse power analysis; CI_TPTD, cardiac index by transpulmonary thermodilution, CI of LOA, confidence interval of the limits of agreement; Values are given as mean ± SD.

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