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

Table 4 Comparison of energy and nutrient intakes obtained from the two FFQs and 24Hs among the school-aged children in Cambodia (n = 107)

Energy and nutrients	Mean (standard deviation)			% mean difference		Variance ratio^c
Energy and nutrients	FFQ1	FFQ2	24Hs	FFQ1 vs. FFQ2^a	FFQ1 vs. 24Hs^b	S²w/S²b^d
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

^a % mean difference for FFQ1 vs. FFQ2 individually calculated as: (FFQ2-FFQ1)/FFQ1 × 100
^b % mean difference for FFQ1 vs. 24Hs individually calculated as: (FFQ1-24Hs)/24Hs × 100
^cVariance ratios were calculated from the estimated values of two 24-h recall surveys conducted in 107 children from Phnom Penh, Cambodia
^dS²w: within-person variation, S²b: between-person variation
FFQ food frequency questionnaire, FFQ1 the first FFQ, FFQ2 the second FFQ, 24Hs the mean of the two 24-h recall surveys (24Hs)

ISSN: 1475-2891