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Table 2 Comparisona of reported soy isoflavones and nutrient intake on the web-based food frequency questionnaire with the reference method (food records with digital photographs) without energy adjustment and with energy adjustment (n = 55)

From: Evaluation of the relative validity of a Web-based food frequency questionnaire used to assess Soy Isoflavones and nutrient intake in adolescents

  Without Energy Adjustment With Energy Adjustment
  Web-based FFQ Food Records   Web-based FFQ Food Records  
Nutrient Median IQRb Median IQR p-valuea Median IQR Median IQR p-value
Energy, MJ 8.77 6.29 7.63 2.56 0.02      
Total isoflavones, mg 9.31 30.50 3.16 18.03 <0.001 9.40 29.24 2.64 13.47 <0.001
 Daidzein, mg 3.50 12.70 1.35 7.05 <0.001 3.57 11.94 1.03 5.39 <0.001
 Genistein, mg 4.98 15.37 1.68 9.37 <0.001 4.92 14.82 1.36 7.09 <0.001
 Glycitein, mg 0.82 2.96 0.27 1.50 <0.001 1.07 2.70 0.27 1.24 <0.001
Fat, g 81.33 48.36 65.19 27.63 <0.001 78.89 10.92 62.39 14.37 <0.001
 SFA, g 26.41 16.66 21.25 9.15 <0.001 26.20 8.58 19.59 7.45 <0.001
 MUFA, g 27.75 18.29 21.85 10.00 0.001 26.21 4.83 20.88 3.97 <0.001
 PUFA, g 21.50 12.93 17.05 7.06 0.001 20.01 7.28 15.79 4.65 <0.001
 Trans fats, g 2.35 1.52 2.11 1.29 0.12 2.38 0.92 2.27 1.10 0.13
Carbohydrate, g 266.33 137.70 242.66 90.64 0.46 251.84 34.06 253.35 34.48 0.16
Protein, g 80.66 57.78 62.40 28.15 <0.001 76.46 11.29 62.99 16.59 <0.001
 Animal protein, g 29.88 29.70 25.36 23.53 0.004 30.19 23.99 26.34 23.25 <0.001
 Vegetable protein, g 44.88 27.37 35.92 21.10 <0.001 44.80 19.45 35.63 12.66 <0.001
Dietary fiber, g 26.75 15.01 20.20 12.23 <0.001 25.74 9.06 20.32 7.92 <0.001
Beta carotene, mcg 4038.70 3816.72 2547.64 2502.86 0.002 3629.93 2578.13 2432.11 2355.71 0.002
Retinol, mcg 512.33 354.03 386.66 251.29 <0.001 494.90 210.82 396.22 215.04 <0.001
Vitamin E, mg 10.07 6.57 9.42 4.57 0.56 9.03 3.09 9.69 3.33 0.06
Vitamin C, mg 133.10 96.47 76.72 71.61 <0.001 130.15 87.41 75.53 69.30 <0.001
Folate, mcg 606.31 374.12 422.31 208.30 <0.001 578.85 195.57 439.31 165.14 <0.001
Vitamin B12, mcg 6.62 4.14 4.07 2.54 <0.001 6.09 2.59 3.70 2.27 <0.001
Calcium, mg 1149.29 547.37 855.00 514.07 <0.001 1125.58 400.07 839.31 382.86 <0.001
Iron, mg 17.82 8.30 14.21 6.32 <0.001 17.23 3.80 14.07 3.38 <0.001
Zinc, mg 11.72 6.41 7.81 4.97 <0.001 11.60 2.36 8.37 3.36 <0.001
Caffeine, mg 9.06 24.06 4.64 15.67 0.07 8.39 19.36 4.62 15.53 0.05
  1. aWilcoxon Signed Ranks test
  2. bIQR, interquartile range
  3. SFA saturated fatty acid, MUFA monounsaturated fatty acid, PUFA polyunsaturated fatty acid
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