Bland-Altman analysis of three arterial hemodynamics for repeated measurement. The difference (y-axis) and mean (x-axis) are shown for hemodynamics (blood velocity, vessel diameter, and blood flow, respectively) in the three arteries between two measurements obtained over three different days. Results are based on 180 samplings (comparison between 1st and 2nd, 2nd and 3rd, and 3rd and 1st measurements) in 60 participants. The solid line indicates bias (close to zero) and the dashed lines are the limits of agreement of ± 1.96 SD (± 2 SD on the figure). The open circles correspond to 1st vs. 2nd measurement. The grey circles correspond to 2nd vs. 3rd measurement. The closed circles correspond to 3rd vs. 1st measurement. All measurements were obtained by a single operator, using the same ultrasound instrument. Thus, no systematic bias (fixed bias or proportional bias) exists between two measurements. Ao, abdominal aorta; LFA, left femoral artery; RFA, right femoral artery. Material reproduced with additional data in the adapted figure, with Bland-Altman analysis, from Osada et al. , with permission from IOP Publishing Ltd.