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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)

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

Energy and nutrients Spearman's correlation coefficients % classified into same ±1 quartileb % Misclassifiedb
Crude Energy-adjusteda
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
  1. *Significant (p < 0.05), **Highly significant (p < 0.01)
  2. aAdjustment for energy was done by the residual method
  3. 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