Figure 5From: A new efficient trial design for assessing reliability of ankle-brachial index measures by three different observer groups Bland-Altman plot of difference between first ABI measurements by all six angiologists and six GPs on a total of 108 subjects in groups 1–3. Figure legend: red circles = subjects, black line = mean difference, blue lines = ± 2SD; in each case, the first measurement by the angiologist is compared to the corresponding first measurement by the GP on the same patient; for comparison, the difference between a healthy patient (ABI > 1.1) and a suspected PAD patient (ABI < 0.9) is 0.2 ABI points.Back to article page