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Table 3 Validation study: median daily intakes of food and nutrients based on the average of two FFQs and the average of three 24-h recalls; Pearson correlation coefficients between FFQs and 24-h recalls 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 Average of two FFQ Median (P25,P75) Average of three 24HR Median (P25,P75) %FFQ/24HR (Median) Pearson correlation coefficients  
Un-adjusted Energy adjusted Energy adjusted and de-attenuated P Value
Food groups        
Cereals (g/day) 186(158 -212) 200(150-240)# 93 0.36 0.32 0.37 <0.01
Meats (g/day) 31(14-50) 48(18-78)## 65 0.47 0.31 0.41 <0.01
Fish (g/day) 25(13-43) 25(0-64) 100 0.42 0.27 0.38 <0.01
Eggs (g/day) 39(29-50) 30(20-53) 130 0.35 0.36 0.41 <0.01
Beans (g/day) 8(4-15) 5(0-13)## 160 0.28 0.30 0.35 <0.01
Vegetables (g/day) 289 (192-423) 275(175-345)# 105 0.35 0.33 0.39 <0.01
Fruits (g/day) 420(295-560) 300(200-433)## 140 0.53 0.48 0.56 <0.01
Nuts (g/day) 5(12-20) 9(0-25) 56 0.45 0.37 0.56 <0.01
Milk & milk products (g/day) 170(76-280) 125 (0-240)## 136 0.45 0.43 0.50 <0.01
Beverages (ml/day) 27(0-86) 0(0-0)## --- 0.30 0.30 0.38 <0.01
Nutrients        
Energy (kca/dayl) 1754.5 (1479.5-2013.0) 1705.5 (1446.5-1999.0) 103 0.54    
Protein (g/day) 56.7 (45.2-69.3) 56.8 (47.2-71.2) 100 0.59 0.55 0.63 <0.01
High quality protein (g/day) 26.1 (18.4-34.9) 27.5 (20.1-38.3) 95 0.58 0.48 0.54 <0.01
Fat (g/day) 51.9 (45.2-59.3) 52.8 (42.2-69.0)# 98 0.50 0.39 0.46 <0.01
Carbohydrate (g/day) 263.9 (221.0-301.2) 243.1 (209.4-284.6)# 109 0.45 0.36 0.42 <0.01
Dietary fibe (g/day) 15.3 (11.6-20.8) 12.4 (10.4-15.6)## 123 0.35 0.26 0.31 <0.01
Cholesterol (mg/day) 347.3 (268.1-427.3) 319.8 (207.4-485.2) 109 0.51 0.46 0.54 <0.01
Vitamin A (μg/day) 872.0(655.8.0-1146.0) 556.3 (373.9-746.5)## 157 0.38 0.18 0.21 0.05
Thiamin (mg/day) 1.0 (0.9-1.2) 0.9 (0.7-1.1)## 111 0.27 0.21 0.26 0.02
Riboflavin (mg/day) 1.1 (0.9-1.7) 0.9 (0.7-1.1)## 122 0.36 0.11 0.13 0.21
Vitamin C (mg/day) 164.4 (125.3-204.1) 123.8 (92.6-178.0)## 133 0.40 0.34 0.39 <0.01
Vitamin E (mg/day) 8.0 (6.1-9.7) 7.2 (5.1-9.2)# 111 0.35 0.28 0.31 <0.01
Choline (mg/day) 89.0 (68.9-102.8) 75.3 (52.3-104.8)# 118 0.39 0.40 0.47 <0.01
Niacin (mg/day) 11.8 (9.6-14.5) 11.8 (9.2-14.9) 100 0.54 0.43 0.50 <0.01
Folate (μg/day) 133.6 (94.0-170.1) 98.5 (64.0-144.5)## 136 0.38 0.27 0.32 <0.01
Calcium (mg/day) 608.4 (472.0-860.9) 503.1 (407.1-643.2)## 121 0.46 0.37 0.42 <0.01
Phosphorus (mg/day) 941.5 (748.1-1183.8) 930.0 (738.8-1128.2) 101 0.54 0.19 0.22 0.04
Potassium (mg/day) 2481.5 (1799.2-3058.8) 2041.0 (1641.6-2466.5)## 122 0.49 0.38 0.43 <0.01
Sodium (mg/day) 481.0 (312.0-735.0) 600.3 (359.7-892.6) 80 0.20 0.11 0.13 0.22
Magnesium (mg/day) 297.9 (233.8-380.1) 274.9 (216.1-347.6)## 108 0.49 0.35 0.41 <0.01
Iron (mg/day) 19.6 (15.3-26.2) 17.8 (14.2-21.1)## 110 0.34 0.21 0.23 0.02
Zinc (mg/day) 9.5 (7.8-11.5) 9.4 (7.6-11.6) 101 0.33 0.19 0.23 0.03
Selenium (μg/day) 35.4 (27.6-44.5) 35.9 (28.3-54.8)# 99 0.58 0.51 0.61 <0.01
Copper (mg/day) 2.1 (1.7-2.6) 2.0 (1.6-2.5) 105 0.31 0.21 0.24 0.02
Iodine (μg/day) 15.4 (10.8-23.0) 9.1 (5.0-17.5)## 169 0.15 0.10 0.11 0.30
  1. Based on log-transformed values; #p<0.05, ##p<0.01 Compared with average intakes estimated by two FFQ administrations using Wilcoxon’s signed rank test
  2. P Value of energy adjusted Pearson correlation coefficients between average intakes obtained from two FFQs and three 24-h recalls