Fig. 2From: Short- and long-term reproducibility of peripheral superficial vein depth and diameter measurements using ultrasound imagingBland–Altman plots for vein depth (left) and vein diameter (right). The differences (y axis) between the mean values obtained in 2 experimental days were plotted against their mean value (x axis). Dashed lines designated upper and lower limits of 95% confidence interval of the difference. Fixed and proportional biases were not found in either vein depth or vein diameterBack to article page