Figure 2From: Validity and reproducibility of folate and vitamin B12 intakes estimated from a self-administered diet history questionnaire in Japanese pregnant women Bland-Altman plot comparing vitamin B 12 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.Back to article page