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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

From: Reproducibility and relative validity of a semi-quantitative food frequency questionnaire for Chinese pregnant women

Food groups or nutrients FFQ1 FFQ2 %FFQ2/FFQ1 Intraclass correlation coefficients(95 % CI) P Value
Median (P25,P75) Median(P25,P75) Median
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
  1. Based on log-transformed values
  2. *p<0.05, **p<0.01 Compared with intakes estimated by FFQ1 using Wilcoxon’s signed rank test
  3. P Value of intraclass correlation coefficients between two FFQ administrations