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Figure 3 | International Journal of Behavioral Nutrition and Physical Activity

Figure 3

From: Reproducibility and comparative validity of a food frequency questionnaire for Australian children and adolescents

Figure 3

Bland Altman plot of the difference between log-transformed data of calcium intake measured by FFQ1 and FFQ2 and the average of the assisted 24-hr recalls, plotted against the mean calcium intake of the two methods, for the comparative validity analysis. The solid horizontal line in the centre indicates the mean difference between the two methods (34% greater for the FFQ - antilog) and the solid lines above and below this indicate ± 2SDs (-53% to 336% - antilog).

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