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Table 4 Cross-classification of the ranked quartile nutrient and isoflavones intake estimates between the webFFQ and FR (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

Nutrient % Exact match % Exact match ± 1 quartile % Gross mismatch
Energy, kcal 32.7 69.1 7.3
Total isoflavones, mg 45.5 81.8 0.0
 Daidzein, mg 49.1 83.6 1.8
 Genistein, mg 47.3 81.8 1.8
 Glycitein, mg 38.2 80.0 5.5
Fat, g 29.1 79.0 1.8
 SFA, g 41.8 80.0 1.8
 MUFA, g 27.3 76.4 9.1
 PUFA, g 39.0 78.2 7.3
 Trans fats, g 40.0 76.4 3.6
Carbohydrate, g 38.2 70.9 3.6
Protein, g 32.7 80.0 3.6
 Animal protein, g 52.7 89.1 0.0
 Vegetable protein, g 47.3 99.0 0.0
Dietary fiber, g 49.1 83.6 1.8
Beta carotene, mcg 34.5 69.1 9.1
Retinol, mcg 29.1 65.5 7.3
Vitamin E, mg 43.6 72.7 0.0
Vitamin C, mg 40.0 72.7 3.6
Folate, mcg 29.1 67.3 1.8
Vitamin B12, mcg 25.5 61.8 10.9
Calcium, mg 32.7 69.1 7.3
Iron, mg 34.5 79.0 3.6
Zinc, mg 34.5 76.4 12.7
Caffeine, mg 36.4 72.7 7.3
  1. webFFQ web-based food frequency questionnaire, FR food records with digital photographs, SFA saturated fatty acid, MUFA monounsaturated fatty acid, PUFA polyunsaturated fatty acid