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Table 2 Mean values and standard deviations for absolute daily nutrient intakes estimated by FFQ and 24HRs

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

Nutrient

FFQ

 

24HRs

FCT1a

FCT2b

FCT3c

Total energy, kcal

1,932.0 (1,092.2)

1,891.1 (1,075.5)

1,885.5 (1,062.3)

 

1,417.6 (493.1)

Protein, g

69.6 (43.7)

66.9 (42.1)

68.6 (43.3)

 

58.1 (24.4)

Total fat, g

33.8 (30.0)

30.2 (24.8)

34.4 (30.2)

 

34.5 (23.4)

Carbohydrate, g

324.5 (189.8)

322.2 (189.1)

318.3 (177.3)

 

218.1 (78.7)

Fiber, g

12.3 (12.9)

10.7 (11.1)

18.5 (14.9)

 

9.3 (7.5)

Vitamin A, µg

523.3 (359.4)

275.2 (207.1)

205.4 (163.7)

 

442.7 (520.8)

Vitamin B1, mg

1.2 (1.8)

1.2 (1.9)

1.2 (1.9)

 

0.7 (0.4)

Vitamin B2, mg

1.8 (8.0)

1.9 (8.9)

2.0 (8.9)

 

0.7 (0.3)

Vitamin C, mg

93.8 (71.4)

92.4 (86.7)

52.1 (70.9)

 

70.6 (47.1)

Calcium, mg

522.6 (399.5)

425.1 (314.2)

392.1 (353.8)

 

405.4 (206.5)

Phosphorus, mg

1,025.3 (613.7)

900.1 (530.2)

930.7 (579.1)

 

820.4 (309.6)

Potassium, mg

1,816.5 (1,215.6)

1,656.6 (1,159.3)

2,227.1 (1,419.4)

 

1,463.1 (695.6)

Sodium, mg

1,014.3 (1,179.5)

775.1 (1,133.5)

1,236.6 (1,485.4)

 

745.6 (686.4)

Iron, mg

22.3 (22.6)

20.0 (20.1)

28.8 (37.5)

 

17.4 (7.9)

Zinc, mg

11.9 (6.6)

11.1(6.5)

10.4 (5.9)

 

9.5 (3.6)

Copper, mg

2.5 (1.6)

2.2 (1.5)

2.7 (1.9)

 

1.8 (1.2)

Manganese, mg

6.5 (3.9)

8.2 (4.8)

12.4 (7.5)

 

4.9 (2.0)

  1. Abbreviations: FFQ, food frequency questionnaire; 24HRs, 3-day 24-hour dietary recalls; FCT, Food Composition Table;
  2. a FCT1 (WFCT) was calculated for each food group based on the weighted mean of the top 80% of food items by intake amount
  3. 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
  4. c FCT3 (‘All food item’ method) was calculated for each food group based on the arithmetic mean of all food items in CFCT