TABLE 4.

Interobserver and Intraobserver Consistency for Quantifying Regurgitant Volume by 4D Flow

	Mitral Regurgitation			Tricuspid Regurgitation
	Pearson	95% Limits of agreement	ICC	Pearson	95% Limits of agreement	ICC
Regurgitant flow volume (L/min)
Interobserver
Direct	0.929	(−1.56, 1.44)	0.935	0.992	(−1.32, 1.48)	0.985
Indirect	0.877	(−1.10, 1.50)	0.873	0.994	(−1.78, 0.83)	0.984
Intraobserver (direct)
Reader 1	0.988	(−0.73, 0.61)	0.988	0.999	(−0.84, 0.52)	0.998
Reader 2	0.986	(−0.73, 0.68)	0.986	0.998	(−0.63, 0.47)	0.998
Regurgitant fraction (%)
Interobserver
Direct	0.861	(−16.0, 15.3)	0.870	0.975	(8.59, 9.70)	0.977
Indirect	0.838	(−14.6, 19.5)	0.769	0.968	(−22.1, 11.9)	0.902
Intraobserver (direct)
Reader 1	0.983	(−6.37, 5.51)	0.984	0.995	(−4.97, 3.15)	0.995
Reader 2	0.976	(−8.53, 6.79)	0.974	0.992	(−5.34, 4.62)	0.993
Regurgitant volume (ml/beat)
Interobserver
Direct	0.909	(−26.6, 22.4)	0.913	0.990	(−19.9, 25.0)	0.982
Indirect	0.871	(−20.3, 25.1)	0.845	0.985	(−31.0, 14.8)	0.962
Intraobserver (direct)
Reader 1	0.988	(−9.82, 8.49)	0.989	0.998	(−10.90, 6.90)	0.997
Reader 2	0.985	(−10.9, 10.4)	0.986	0.998	(−8.72, 6.35)	0.998

Data in parentheses are Bland-Altman 95% limits of agreement.

ICC = interclass correlation coefficient, 2-way random effects absolute agreement model.