Validity of food and nutrient intakes assessed by a food frequency questionnaire among Chinese adults

Nutrition Journal

Table 3 Spearman correlation coefficients of daily nutrient intakes between FFQ and 24HRs

Nutrient	FCT1^a			FCT2^b			FCT3^c
	Unadjusted	Energy-adjusted		Unadjusted	Energy-adjusted		Unadjusted	Energy-adjusted
	Unadjusted	Residual method	Energy Density	Unadjusted	Residual method	Energy Density	Unadjusted	Residual method	Energy Density
Total energy, kcal	0.38			0.37			0.37
Protein, g	0.41	0.36	0.35	0.41	0.32	0.31	0.41	0.36	0.35
Total fat, g	0.41	0.26	0.31	0.40	0.27	0.31	0.40	0.23	0.28
Carbohydrate, g	0.29	0.33	0.38	0.29	0.33	0.38	0.27	0.28	0.35
Fiber, g	0.26	0.27	0.30	0.25	0.25	0.28	0.25	0.26	0.27
Vitamin A, µg	0.23	0.19	0.19	0.25	0.21	0.19	0.24	0.17	0.16
Vitamin B1, mg	0.33	0.30	0.30	0.33	0.25	0.25	0.32	0.21	0.21
Vitamin B2, mg	0.41	0.32	0.33	0.42	0.30	0.31	0.41	0.26	0.30
Vitamin C, mg	0.27	0.26	0.27	0.28	0.26	0.26	0.25	0.20	0.20
Calcium, mg	0.31	0.26	0.26	0.30	0.24	0.24	0.33	0.25	0.24
Phosphorus, mg	0.43	0.36	0.33	0.42	0.32	0.30	0.44	0.34	0.32
Potassium, mg	0.34	0.37	0.37	0.34	0.35	0.35	0.32	0.32	0.32
Sodium, mg	0.29	0.25	0.24	0.21	0.17	0.16	0.27	0.23	0.22
Iron, mg	0.29	0.16	0.18	0.29	0.15	0.16	0.26	0.14	0.17
Zinc, mg	0.40	0.26	0.23	0.41	0.25	0.21	0.41	0.24	0.21
Copper, mg	0.29	0.25	0.27	0.29	0.26	0.27	0.28	0.24	0.25
Manganese, mg	0.32	0.26	0.32	0.28	0.16	0.21	0.18	0.09	0.16
Mean	0.33	0.26	0.29	0.33	0.24	0.26	0.32	0.21	0.25

Abbreviations: FFQ, food frequency questionnaire; 24HRs, 3-day 24-hour dietary recalls; FCT, Food Composition Table;
^a FCT1 (WFCT) was calculated for each food group based on the weighted mean of the top 80% of food items by intake amount
^b FCT2 (Reference method) was calculated for each food group based on food items provided in previous studies conducted among participants with similar dietary cultures
^c FCT3 (‘All food item’ method) was calculated for each food group based on the arithmetic mean of all food items in CFCT

ISSN: 1475-2891