Table 3.

Effect of temporal resolution

	Avg by 2	Avg by 3	Avg by 4
archPWVWU
Linear fit slope	1.01	0.93	0.86
Bland-Altman mean bias [limits] (m/s)	0.2 [-1.45 to 1.87]	0.12 [-2.06 to 2.30]	0.10 [-2.50 to 2.71]
Correlation r(p)	0.95 (<0.001)	0.91 (<0.001)	0.87 (<0.001)
archPWVTU
Linear fit slope	0.99	0.60	0.30
Bland-Altman mean bias [limits] (m/s)	0.35 [-1.72 to 2.40]	-0.07 [-4.28 to 4.22]	-0.03 [-7.81 to 7.71]
Correlation r(p)	0.88 (<0.001)	0.72 (<0.001)	0.50 (<0.001)
archPWVF
Linear fit slope	1.03	1.03	0.89
Bland-Altman mean bias [limits] (m/s)	0.16 [-2.51 to 2.8]	0.42 [-3.29 to 4.12]	0.32 [-4.67 to 5.32]
Correlation r(p)	0.97 (<0.001)	0.94 (<0.001)	0.89 (<0.001)

For the three methods, aortic pulse wave velocity (archPWV) estimated from the original ascending and descending aortic flow curves, were used as reference for comparisons against archPWV estimated from curves with lower temporal resolution obtained by averaging time points by blocks of 2 (Avg by 2), 3 (Avg by 3) and 4 (Avg by 4). For these associations the linear fit slope, Bland-Altman mean bias and limits of agreement as well as linear correlation coefficients were provided. Wavelet-based approach is archPWV_WU, time-based approach is archPWV_TU and Fourier-based approach is archPWV_F