Table 4. Interobserver reproducibility and agreement for the aortic annular measurement.

Measurement	Intraclass correlation coefficient (95% confidence interval)			Mean difference (95% limits of agreement)
	40-keV	50-keV	Conventional	40-keV	50-keV	Conventional
Area	0.93 (0.89, 0.96)	0.98 (0.96, 0.99)	0.90 (0.92, 0.97)	0.04 cm2 (−0.55 cm2, 0.63 cm2),	0.06 cm2 (−0.25 cm2, 0.38 cm2),	0.08 cm2 (−0.38 cm2, 0.54 cm2),
Perimeter	0.94 (0.93, 0.96)	0.97 (0.96, 0.98)	0.95 (0.90, 0.97)	0.47 mm (−4.08 mm, 5.02 mm)	0.55 mm (−2.34 mm, 3.44 mm)	0.9 mm (−3.35 mm, 5.15 mm)