Table 2.

Assessment of accuracy between Fick and TD methods

	n	Mean (SD) ${\dot{\mathrm{Q}}}_{\text{C}}/{\dot{\mathrm{Q}}}_{\text{CI}}$	Bland-Altman Mean Bias (+/− 2 SD)	Median Percent Error (IQR)	Rs*	TE*	CV
Overall Fick vs TD ${\dot{\mathrm{Q}}}_{\text{C}}$	253	fick 4.7 (1.7) thermodilution 4.5 (1.3)	0.21 (—2.2–2.7)	17.5 (7.7, 28.4)	0.64 (0.56, 0.71)	0.88 (0.82–0.95)	37.8%
Fick vs TD ${\dot{\mathrm{Q}}}_{\text{CI}}$ (>2.2 L/min/m2)	135	fick 3 (0.7) thermodilution 2.6 (0.6)	−0.42 (−1.76–0.9)	18.9 (6.9, 28.9)	0.34 (0.17, 0.49)	0.49 (0.45, 0.55)	22.5%
Fick vs TD ${\dot{\mathrm{Q}}}_{\text{CI}}$ (<2.2 L/min/m2)	118	fick 1.8 (0.3) thermodilution 2 (0.4)	0.23 (—0.59–1.06)	16.9 (7.9, 28)	0.31 (0.13, 0.47)	0.3 (0.27, 0.33)	17%

^*95% confidence intervals expressed for both R_s and TE.

CV = coefficient of variation; IQR = interquartile range; L = liters; m = meters; min = minute; ${\dot{\mathrm{Q}}}_{\text{C}}$ = cardiac output; ${\dot{\mathrm{Q}}}_{\text{CI}}$ = cardiac index; R_s = Spearman’s rank correlation coefficient; SD = standard deviation; TD = thermodilution; TE = typical error.