Table 5.

Average delay (sec) between area and pressure peak for the Kelvin and sigmoid models. Note “S” and “H” denote if vessels are obtained from sheep and humans, respectively.

Thoracic Descending Aorta
	Kelvin	Sigmoid
S - Ex vivo	0.025 ± 0.006†	0.034 ± 0.008†
S - In vivo	0.022 ± 0.009	0.032 ± 0.013

Carotid artery
	Kelvin	Sigmoid
S - Ex vivo	0.016 ± 0.003	0.022 ± 0.004
H - In vivo	0.031 ± 0.011	0.057 ± 0.020

^†Comparison of means ex vivo vs. in vivo not statistically different (p < 0.05).