Figure 1.

Bland-Altman plot comparing folate intake estimated from the two-time DHQ. DHQ: self-administered diet history questionnaire. The difference between folate intakes estimated from the two-time DHQ for each person (y-axis) is plotted against the mean folate 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.