Fig. 3
From: Non-invasive assessment of vascular alteration using ultrasound
a Average peak circumferential strain rate according to age group. b Fractional area change according to age group. c The SD of time to peak circumferential strain rate (Tsr-SD) according to age group. Data are presented as mean ± SD. SD = standard deviation; Tsr = time to peak circumferential strain rate. *P > 0.05, †P < 0.05, ‡P < 0.01(adapted from Ref [29])