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Table 4 Reproducibility study: Median daily energy and nutrient intakes, correlation coefficients and agreement between FFQ1and FFQ2 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 –valuec

Correlation coefficient

Agreement

Percentage classified in

FFQ1a

FFQ2b

rsd

rie

Same quartile

Same or adjacent quartile

Extreme quartile

Energy (kcal/day)

2006.2 (1632.9, 2229.3)

2009.4 (1635.7, 2231.4)

0.91

0.59**

0.70**

65.5

84.1

6.2

Protein (g/day)

85.4 (69.1, 103.9)

84.5 (68.1, 99.5)

0.68

0.61**

0.55**

46.9

82.3

5.3

Fat (g/day)

88.3 (73.1, 98.7)

83.0 (70.9, 95.5)

0.19

0.44**

0.34**

43.4

83.2

7.1

Total Fatty acid (g/d)

68.6 (47.7, 86.5)

61.5 (43.9, 82.7)

0.17

0.43**

0.45**

43.7

82.2

7.2

SFA (g/d) f

14.5 (8.0, 22.7)

11.6 (7.2, 17.6)

0.06

0.41**

0.33*

48.2

80.4

8.1

MUFA (g/d) g

25.3 (15.0, 36.2)

21.9 (13.4, 31.9)

0.11

0.39**

0.38**

44.6

81.3

8.1

PUFA (g/d) h

11.9 (7.0, 17.7)

10.4 (6.6, 17.0)

0.73

0.43**

0.41**

46.4

83.2

6.3

n-3 PUFA (g/d) i

0.06 (0.04, 0.10)

0.06 (0.04, 0.09)

0.14

0.35**

0.28*

41.9

76.9

8.1

n-6 PUFA (g/d) j

0.80 (0.50, 1.14)

0.76 (0.50, 1.01)

0.17

0.29**

0.33*

51.8

78.8

10.8

Carbohydrate (g/d)

212.5 (171.6, 250.8)

216.4 (170.4, 260.4)

0.41

0.50**

0.55**

45.1

83.2

5.3

Dietary fiber (g/d)

15.0 (10.7, 20.5)

14.8 (10.9, 19.8)

0.85

0.33**

0.36**

43.6

77.9

8.8

Vitamin A (μgRAE/day) k

857.2 (597.3, 1330.3)

721.5 (559.2, 976.9)

0.04

0.25**

0.27*

41.6

73.5

10.6

Thiamin (mg/day)

0.9 (0.7, 1.1)

0.9 (0.7, 1.1)

0.69

0.53**

0.47**

51.3

84.9

4.4

Riboflavin (mg/day)

1.3 (1.1, 1.7)

1.3 (1.1, 1.5)

0.17

0.42**

0.29**

46.0

74.3

8.0

Niacin (mg/day)

20.3 (15.9, 26.9)

20.0 (15.3, 24.5)

0.21

0.57**

0.50**

50.4

82.3

2.7

Vitamin C (mg/day)

135.4 (78.6, 194.1)

139.6 (96.6, 194.0)

0.67

0.31**

0.43**

38.9

75.2

8.0

Vitamin E (mg/day)

34.0 (30.3, 40.6)

35.9 (30.9, 41.9)

0.38

0.30**

0.32**

46.0

77.9

8.0

Calcium (mg/day)

625.4 (501.3, 789.9)

706.0 (542.2, 845.7)

0.13

0.39**

0.53**

38.9

77.0

6.2

Phosphorus (mg/day)

1261.1 (1041.8, 1495.3)

1304.6 (1056.1, 1500.3)

0.68

0.59**

0.52**

45.1

88.5

2.7

Potassium (mg/day)

2555.9 (2105.9, 3258.7)

2568.9 (2126.1, 3298.8)

0.93

0.47**

0.59**

52.2

80.5

3.5

Magnesium (mg/day)

356.5 (286.1, 431.9)

362.5 (289.2, 446.3)

0.59

0.44**

0.50**

43.4

78.8

8.0

Iron (mg/day)

25.1 (20.0, 31.8)

24.9 (20.5, 31.2)

0.77

0.45**

0.32**

51.3

80.5

8.0

Zinc (mg/day)

12.9 (10.6, 15.8)

13.1 (10.5, 15.7)

0.92

0.58**

0.66**

52.2

87.6

4.4

Selenium (μg/day)

58.5 (50.7, 73.2)

58.7 (47.7, 69.9)

0.59

0.26**

0.29*

38.9

75.2

9.7

Copper (mg/day)

2.4 (1.8, 3.0)

2.5 (2.0, 3.1)

0.71

0.48**

0.44**

49.6

78.8

4.4

Manganese (mg/day)

4.9 (4.0, 6.1)

5.2 (4.0, 6.7)

0.23

0.44**

0.48**

46.9

81.4

5.3

  1. a FFQ1: the first food frequency questionnaire which was conducted at 60–65 days postpartum
  2. b FFQ2: the second food frequency questionnaire which was conducted at 5 weeks later during follow-ups
  3. c p -value: Wilcoxon signed rank test
  4. d rs: Spearman rank correlation coefficients
  5. e ri: Intra-class correlation coefficients
  6. f SFA: saturated fatty acid
  7. g MUFA: monounsaturated fatty acid
  8. h PUFA: polyunsaturated fatty acid
  9. I n-3 PUFA: n-3 polyunsaturated fatty acid
  10. j n-6 PUFA: n-6 polyunsaturated fatty acid
  11. k RAE: retinol activity equivalent
  12. *p < 0.05, **p < 0.01
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Nutrition Journal

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