Table 3

Comparison of methods of planimetry of aortic valve area

Method	No of patients	Aortic valve area (cm²)
Method	No of patients	Mean (SD)		Range
CMR	40	0.80 (0.25)		0.45–1.40
TOE	35	0.80 (0.28)		0.45–1.60
TTE	41	0.74 (0.30)		0.35–1.80
CC	39	0.75 (0.23)		0.40–1.60
CMR (intraobserver)	20	0.81 (0.23)		0.50–1.50
CMR (interobserver)	20	0.82 (0.24)		0.50–1.50

		MD (SD) (cm²)	Limits of agreement (cm²)
		MD (SD) (cm²)	MD − 2SD (95% CI)	MD + 2SD (95% CI)
CMR/CC	36	0.09 (0.19)	−0.30 (−0.41 to −0.18)	0.47 (0.35 to 0.58)
CMR/TOE	32	0.02 (0.21)	−0.39 (−0.52 to −0.26)	0.42 (0.29 to 0.55)
CMR/TTE	37	0.05 (0.20)	−0.35 (−0.46 to −0.23)	0.44 (0.33 to 0.56)
CC/TOE	30	−0.05 (0.26)	−0.57 (−0.74 to −0.40)	0.47 (0.30 to 0.64)
CC/TTE	36	−0.03 (0.25)	−0.52 (−0.67 to −0.38)	0.46 (0.31 to 0.61)
TOE/TTE	32	0.01 (0.18)	−0.34 (−0.45 to −0.23)	0.35 (0.24 to 0.46)
Intraobserver variability	20	−0.02 (0.06)	−0.13 (−0.18 to −0.09)	0.09 (0.04 to 0.13)
Interobserver variability	20	0.03 (0.05)	−0.07 (−0.11 to −0.03)	0.12 (0.08 to 0.16)