Table 2 Reproducibility study: median daily intakes of foods and nutrients estimated by FFQs and intraclass correlation coefficients between FFQ1 and FFQ2 completed by 123 pregnant Chinese women, January 2013 to April 2014

Food groups

Cereals (g/day)

175 (135-220)

187(160-225)

107

0.25(0.08,0.41)

<0.01

Meats (g/day)

27(7-46)

29(13-54)

107

0.37(0.20,0.51)

<0.01

Fish (g/day)

19(7-43)

25(11-47) ^*

132

0.40(0.24,0.54)

<0.01

Eggs (g/day)

43 (21-50)

50(29-50)^*

116

0.30(0.13,0.45)

<0.01

Beans (g/day)

7 (3-15)

6(3-15)

86

0.26(0.09,0.42)

<0.01

Vegetables (g/day)

255(165-394)

283(183-454)

111

0.34(0.18,0.49)

<0.01

Fruits (g/day)

428 (287-566)

421(278-574)

98

0.49(0.34,0.61)

<0.01

Nuts (g/day)

11(4-20)

10(3-20)

91

0.23(0.05,0.39)

<0.01

Milk & milk products (g/day)

143 (32-257)

200(46-305) ^*

140

0.31(0.14,0.46)

<0.01

Beverages (ml/day)

16(0-96)

0(0-57)

0

0.24(0.06,0.40)

<0.01

Nutrients

Energy (kcal/day)

1713.0 (1370.0-2038.0)

1776.0(1510.0-2140.0)

104

0.52(0.37,0.63)

<0.01

Protein (g/day)

52.2 (41.3-67.3)

58.9 (46.4-72.9) ^*

113

0.52(0.38,0.64)

<0.01

High quality protein (g/day)

22.7(14.0-33.2)

27.7 (20.9-37.6) ^*

122

0.48(0.33,0.60)

<0.01

Fat (g/day)

50.5 (42.0-58.5)

53.2 (45.4-61.6)

105

0.44(0.29,0.57)

<0.01

Carbohydrate (g/day)

262.1(200.1-314.9)

267.7 (215.5-313.0)

102

0.43(0.28,0.56)

<0.01

Dietary fiber (g/day)

14.1 (10.4-19.3)

14.8 (11.0-21.3)

105

0.37(0.21,0.52)

<0.01

Cholesterol (mg/day)

335.4 (196.6-407.1)

373.6 (284.4-451.6) ^**

111

0.35(0.18,0.49)

<0.01

Vitamin A (μg/day)

853.0 (566.3-1200.3)

884.7(615.6-1259.9)

104

0.41(0.26,0.53)

<0.01

Thiamin (mg/day)

1.0 (0.8-1.3)

1.0 (0.8-1.2)

100

0.44(0.28,0.57)

<0.01

Riboflavin (mg/day)

1.0 (0.8-1.5)

1.2 (0.9-1.7)

120

0.51(0.37,0.61)

<0.01

Vitamin C (mg/day)

160.2 (112.8-213.3)

153.0 (115.5-199.7)

96

0.40(0.24,0.54)

<0.01

Vitamin E (mg/day)

7.9 (5.4-10.2)

7.8 (5.9-9.9)

99

0.34(0.18,0.49)

<0.01

Choline (mg/day)

83.1 (53.7-104.4)

95.6 (71.6-113.1) ^*

115

0.31(0.15,0.46)

<0.01

Niacin (mg/day)

11.3 (8.1-13.7)

11.8 (9.5-15.5)

104

0.47(0.32,0.60)

<0.01

Folate (μg/day)

122.4 (88.6-168.7)

124.1 (91.4-201.4)

101

0.38(0.22,0.52)

<0.01

Calcium (mg/day)

553.1 (392.3-857.4)

639.8 (460.8-909.0)

116

0.44(0.29,0.58)

<0.01

Phosphorus (mg/day)

901.7 (706.7-1138.0)

988.2 (794.1-1246.4)

110

0.56(0.43,0.67)

<0.01

Potassium (mg/day)

2259.7(1736.2-3134.5)

2404.2(1934.7-3159.2)

106

0.53(0.39,0.65)

<0.01

Sodium (mg/day)

450.2 (269.0-744.7)

463.0 (320.6-825.2)

103

0.50(0.35,0.62)

<0.01

Magnesium (mg/day)

285.0 (216.7-397.1)

303.4 (236.3-396.6)

106

0.53(0.39,0.65)

<0.01

Iron (mg/day)

18.1 (13.8-23.6)

20.2 (15.2-25.3)

111

0.40(0.24,0.54)

<0.01

Zinc (mg/day)

9.1 (7.0-10.9)

9.9 (7.9-12.4) ^*

109

0.47(0.32,0.60)

<0.01

Selenium (μg/day)

32.8 (24.0-42.9)

36.2 (27.1-48.6) ^**

110

0.58(0.44,0.68)

<0.01

Copper (mg/day)

2.0 (1.4-2.5)

2.1 (1.5-2.6)

105

0.40(0.24,0.54)

<0.01

Iodine (μg/day)

15.9 (7.7-24.5)

14.9 (8.4-24.1)

94

0.24(0.06,0.40)

0.01