Table 2 Comparison of mean aortic valve area, correlation coefficient and mean absolute differences between different echo techniques.

	Mean (SD) AVA (cm2)	Correlation (r value, mean difference (cm2))
		vs RT3D	vs TEE	vs 2D‐TTE
3D/2D	1.04 (0.49)	r = 0.99, p<0.001, Δ = 0.008	r = 0.98, p<0.001, Δ = 0.041	r = 0.98, p<0.001, Δ = 0.009
RT3D	1.03 (0.48)		r = 0.97, p<0.001, Δ = 0.049	r = 0.99, p<0.001, Δ = 0.001
TEE	1.08 (0.51)			r = 0.96, p<0.001, Δ = 0.050
2D‐TTE	1.03 (0.48)

AVA, aortic valve area; 3D/2D, 3D‐guided two‐dimensional imaging; RT3D, volumetric real‐time three‐dimensional echocardiography; TEE, planimetry by transoesophageal echocardiography; 2D‐TTE, Doppler‐derived two‐dimensional transthoracic echocardiography; Δ, mean absolute differences.