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Table 6 Relative validity study: Median daily energy and nutrient intakes, correlation coefficients and agreement between FFQ and 3DR in 112 lactating mothers

From: Reproducibility and relative validity of a semi-quantitative food frequency questionnaire for the Chinese lactating mothers

Energy and nutrients

Intake value

Median (P25, P75)

p- value c

Correlation coefficient

Agreement

Percentage classified in

FFQ a

3DR b

r d

r e-adj e

r de-att f

Same quartile

Same or adjacent quartile

Extreme quartile

Energy (kcal/day)

2017.7 (1712.9, 2222.4)

1992.4 (1636.3, 2232.8)

0.87

0.72**

 

0.77**

62.8

91.1

4.4

Protein (g/day)

85.7 (70.1, 101.6)

83.4 (71.9, 100.6)

0.72

0.67**

0.31**

0.71**

72.4

95.5

0

Fat (g/day)

86.1 (73.3, 94.8)

77.7 (62.5, 93.2)

0.028

0.51**

0.33**

0.57**

42.5

85.1

4.4

Total Fatty acid (g/d)

66.3 (40.7, 80.3)

51.6 (33.9, 74.5)

0.02

0.48**

0.28**

0.54**

40.2

84.9

4.5

SFA (g/d) g

14.8 (8.8, 19.3)

9.5 (5.2, 18.3)

0.25

0.46**

0.28**

0.53**

37.5

80.4

4.5

MUFA (g/d) h

25.6 (15.3, 2.3)

17.6 (9.1, 29.5)

0.055

0.46**

0.28**

0.53**

40.2

82.1

5.4

PUFA (g/d) i

11.8 (7.6, 17.3)

7.6 (4.3, 11.9)

0.001

0.50**

0.24*

0.51**

36.5

81.2

5.4

n-3 PUFA (g/d) j

0.07 (0.04, 0.09)

0.05 (0.03, 0.10)

0.619

0.44**

0.27**

0.43**

36.6

79.4

4.5

n-6 PUFA (g/d) k

0.80 (0.59, 1.08)

0.71 (0.49, 1.42)

0.187

0.49**

0.28**

0.54**

29.5

83.8

3.6

Carbohydrate (g/d)

217.3 (175.7, 249.1)

222.6 (177.3, 272.0)

0.272

0.71**

0.45**

0.76**

50.4

90.2

2.7

Dietary fiber (g/d)

15.6 (11.8, 20.3)

12.7 (9.7, 16.2)

0.002

0.44**

0.34**

0.57**

38.9

78.7

8.0

Vitamin A (μgRAE/day) l

890.1 (636.1, 1151.6)

842.9 (569.11200.0)

0.90

0.26**

0.24**

0.32**

30.1

73.4

8.0

Thiamin (mg/day)

0.9 (0.8, 1.1)

0.9 (0.8, 1.2)

0.036

0.62**

0.39**

0.68**

54.0

81.4

1.8

Riboflavin (mg/day)

1.4 (1.2, 1.6)

1.3 (1.1, 1.7)

0.69

0.44**

0.30**

0.53**

41.6

80.5

7.1

Niacin (mg/day)

21.1 (16.4, 25.6)

20.1 (14.9, 25.8)

0.65

0.58**

0.41**

0.66**

44.2

84.9

3.5

Vitamin C (mg/day)

137.9 (105.5, 186.2)

109.3 (78.6, 151.3)

< 0.01

0.23*

0.22*

0.28**

38.9

68.1

7.1

Vitamin E (mg/day)

36.5 (31.9, 41.4)

26.7 (23.4, 31.9)

0.005

0.43**

0.29*

0.37**

34.5

76.1

3.5

Calcium (mg/day)

667.4 (546.9, 824.1)

605.7 (432.8, 713.8)

0.013

0.31**

0.24*

0.41**

37.2

70.8

6.2

Phosphorus (mg/day)

1292.5 (1090.6, 1508.8)

1213.3 (1016.5, 1401.4)

0.051

0.63**

0.47**

0.69**

50.4

84.9

2.7

Potassium (mg/day)

2611.8 (2233.9, 3243.3)

2332.7 (1861.1, 2617.2)

0.003

0.44**

0.36**

0.43**

38.1

76.2

4.4

Magnesium (mg/day)

364.1 (306.1, 435.9)

329.8 (277.0, 382.3)

0.027

0.49**

0.33**

0.41**

38.1

84.1

1.8

Iron (mg/day)

26.1 (21.3, 30.5)

24.7 (21.3, 29.7)

0.43

0.39**

0.24*

0.44**

42.5

78.9

5.3

Zinc (mg/day)

13.4 (10.9, 15.7)

13.0 (10.4, 15.6)

0.51

0.64**

0.42**

0.68**

55.8

87.6

2.7

Selenium (μg/day)

61.4 (53.1, 69.7)

62.4 (48.7, 82.7)

0.021

0.41**

0.30**

0.32**

34.5

76.1

3.5

Copper (mg/day)

2.6 (2.0, 3.0)

2.1 (1.7, 2.8)

0.53

0.41**

0.27**

0.51**

31.9

76.1

4.4

Manganese (mg/day)

5.3 (4.3, 6.4)

5.4 (4.1, 6.2)

0.91

0.57**

0.46**

0.62**

49.6

77.9

1.8

  1. a FFQ: average of the FFQ1 and the FFQ2
  2. b 3DR: 3-day dietary records which was completed one week after the FFQ1, including two weekdays and one weekend
  3. c p –value: Wilcoxon signed rank test
  4. d r: Spearman rank correlation coefficients
  5. e r e-adj: Energy-adjusted correlation coefficient
  6. f r de-att: de-attenuated correlation coefficients
  7. g SFA: saturated fatty acid
  8. h MUFA: monounsaturated fatty acid
  9. i PUFA: polyunsaturated fatty acid
  10. j n-3 PUFA: n-3 polyunsaturated fatty acid
  11. k n-6 PUFA: n-6 polyunsaturated fatty acid
  12. l RAE: retinol activity equivalent
  13. *p < 0.05, **p < 0.01
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Nutrition Journal

ISSN: 1475-2891

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