Development, validity and reproducibility of a whole grain food frequency questionnaire in Malaysian children

Nutrition Journal

Table 4 Food frequency questionnaires at visit 1 and visit 2 – comparison of whole grain daily intake, intra-class correlation coefficient, spearman’s correlation coefficient and Cronbach’s alpha (n = 50)

	Median (IqR)				Cross-classification into quartiles; n (%)
	FFQ1	FFQ2	ICC	Cronbach’s alpha	Correctly classified^a	Grossly misclassified^b	Cohen’s Kappa
Whole grain (g)	16.2 (15.6)	20.8 (16.6)	0.989	0.995	50 (100)	0	0.653^***

^aClassified into the same or adjacent (±1) quartile;
^bClassified into opposing quartiles (by ≥2 quartiles)
^***p < 0.001
IqR interquartile range, FFQ1 first administration of the food frequency questionnaire, FFQ2 second administration of the food frequency questionnaire, ICC intra-class correlation coefficient

ISSN: 1475-2891