Table 2.

Intra- and inter-observer variability for time-averaged, peak systolic and diastolic baseline WSS measurements. Values reported are mean ± standard deviation percent differences in WSS values over the entire ascending aorta.The intra- and inter-observer variability are less than the differences in mean values for WSS values between patients with AscAD and controls.

	Time averaged WSS		Peak Systolic WSS		Diastolic Baseline WSS
	AscAD	Controls	AscAD	Controls	AscAD	Controls
Intra-observer Variability	1.16 ± 0.15 %	1.58 ± 2.01 %	5.29 ± 2.02 %	6.40 ± 7.94 %	1.50 ± 0.36 %	0.74 ± 0.88 %
Inter-observer Variability	3.69 ± 4.65 %	7.48 ± 6.47 %	13.26 ± 12.43 %	14.71 ± 12.57 %	8.66 ± 4.74 %	2.84 ± 1.60 %
% Difference of means	19.35%		18.18%		66.67 %