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 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 |
† Based on log-transformed values
*p<0.05, **p<0.01 Compared with intakes estimated by FFQ1 using Wilcoxon’s signed rank test
△P Value of intraclass correlation coefficients between two FFQ administrations