Bland-Altman plot comparing vitamin B12 intake estimated from the two-time DHQ. DHQ: self-administered diet history questionnaire. Difference between vitamin B12 intakes estimated from the two-time DHQ for each person (y-axis) is plotted against the mean vitamin B12 intake averaged from the two-time DHQ (x-axis). The mean difference and the upper and lower 95% limits of agreement are shown by dotted lines.
Shiraishi et al. Nutrition Journal 2012 11:15 doi:10.1186/1475-2891-11-15