Development and validation of a food frequency questionnaire (FFQ) for assessing dietary macronutrients and calcium intake in Cambodian school-aged children

Table 5 FFQ reproducibility: Spearman’s correlation coefficient analysis of agreement and cross-classification analysis for energy and nutrient intakes as reported in FFQ1 and FFQ2 among the school-aged children in Cambodia (n = 107)

Energy and nutrients	Spearman's correlation coefficients		% classified into same ±1 quartile^b	% Misclassified^b
Energy and nutrients	Crude	Energy-adjusted^a	% classified into same ±1 quartile^b	% Misclassified^b
Energy	0.44^**	–	77	6
Protein	0.40^**	0.23^*	78	5
Fat	0.29^**	0.32^**	73	6
Carbohydrates	0.46^**	0.29^**	81	3
Calcium	0.47^**	0.41^**	82	3

*Significant (p < 0.05), **Highly significant (p < 0.01)
^aAdjustment for energy was done by the residual method
^bCross-classification analyses were completed to validate agreement between FFQ1 and FFQ2 in terms of the proportions of participants classified into the same ±1 quantile or misclassified. FFQ food frequency questionnaire, FFQ1 the first FFQ, FFQ2 the second FFQ

ISSN: 1475-2891