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Table 4 Comparison of energy and nutrient intakes obtained from the two FFQs and 24Hs 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 Mean (standard deviation) % mean difference Variance ratioc
FFQ1 FFQ2 24Hs FFQ1 vs. FFQ2a FFQ1 vs. 24Hsb S2w/S2bd
Energy (kcal) 1215 (472) 1073 (368) 1783 (492) − 6 −30 2.1
Protein (g) 33.6 (17.5) 28.0 (12.0) 54.6 (16.8) −6 −37 1.9
Fat (g) 19.3 (12.7) 16.2 (10.3) 36.3 (14.7) 0 − 39 1.5
Carbohydrates (g) 225.5 (83.7) 203.1 (69.0) 309.0 (87.7) −5 −25 1.7
Calcium (mg) 345 (254) 315 (478) 450 (242) 1 −17 1.3
  1. a % mean difference for FFQ1 vs. FFQ2 individually calculated as: (FFQ2-FFQ1)/FFQ1 × 100
  2. b % mean difference for FFQ1 vs. 24Hs individually calculated as: (FFQ1-24Hs)/24Hs × 100
  3. cVariance ratios were calculated from the estimated values of two 24-h recall surveys conducted in 107 children from Phnom Penh, Cambodia
  4. dS2w: within-person variation, S2b: between-person variation
  5. FFQ food frequency questionnaire, FFQ1 the first FFQ, FFQ2 the second FFQ, 24Hs the mean of the two 24-h recall surveys (24Hs)