Table 3.

Statistical comparison between the pre- and post-correction UD velocity parameters (PSV, MV, EDV, PI and RI). Note that, in linear regression analysis, the pre-correction UD velocity parameters are in the X-axis, while the post-correction UD velocity parameters are in the Y-axis. As compared to a quantity estimated by the post-correction UD data, positive and negative mean differences calculated by the Bland-Altman method indicate overestimation and underestimation of the quantity by the pre-correction UD data, respectively.

		PSV	MV	EDV	PI (unitless)	RI (unitless)
Absolute Diff (cm/s) mean ± standard deviation		26.6 ± 15.9	13.4 ± 9.3	7.2 ± 6.6	0.09 ± 0.08	0.02 ± 0.02
Bland-Altman	Mean Diff (cm/s)	26.6	13.4	7.2	0.002	0.006
	l.lim ~ u.lim (cm/s)	6.0 ~ 61.0	−3.1 ~ 36.8	1.0 ~ 27.8	−0.21 ~ 0.28	−0.035 ~ 0.045
Spearman’s Correlation	r	0.94	0.95	0.98	0.96	0.93
	P-value	<0.001	<0.001	<0.001	<0.001	<0.001
Linear Regression	Slope	0.70	0.72	0.73	0.94	0.95
	Y-Intercept (cm/s)	8.2	2.3	2.1	0.09	0.03