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Table 1 Nutrients between directly weighed value and estimates based on the food-photographic record among 1163 test meals

From: Development and validation of nutrient estimates based on a food-photographic record in Japan

  weighed value median (IQR) food photography median (IQR) % differencea median (IQR) correlation coefficientb P for correlation‡
Portion size, g 104.6 (31.2, 210.6) 83.0 (30, 188.6) − 10.6 (−31.3, 15.3) 0.93 < 0.001
Energy, kcal 91.0 (26.0, 202.0) 79.5 (23, 194) −10.0 (−31.8, 18.4) 0.93 < 0.001
Protein, g 4.6 (1.6, 8.5) 4 (1.5, 9.2) −6.3 (−29.5, 26.5) 0.90 < 0.001
Fat, g 2.5 (0.3, 8) 2.1 (0.3, 6.9) −7.3 (−38.3, 25.0) 0.92 < 0.001
 Triglyceride, g 2.1 (0.1, 7) 1.7 (0.1, 6.4) −12.5 (−42.2, 17.7) 0.90 < 0.001
 SFA, g 0.5 (0.02, 1.96) 0.4 (0.03, 1.53) −13.6 (−43.2, 20.4) 0.89 < 0.001
 MUFA, g 0.6 (0.01, 2.86) 0.5 (0.02, 2.47) −13.9 (− 41.4, 21.1) 0.91 < 0.001
 PUFA, g 0.4 (0.03, 2.02) 0.5 (0.04, 2.13) −5.8 (− 35.4, 33.3) 0.90 < 0.001
 Cholesterol, mg 5.2 (0, 37.83) 3.3 (0, 32.54) −20.1 (−45.5, 24.7) 0.87 < 0.001
Carbohydrate, g 6.8 (2.5, 20.5) 5.6 (2.1, 18.4) −8.8 (−32.0, 24.3) 0.94 < 0.001
Total dietary fiber, g 0.8 (0.3, 2) 0.8 (0.2, 1.9) −7.8 (− 33.8, 21.5) 0.90 < 0.001
 Water soluble, g 0.2 (0.01, 0.47) 0.1 (0, 0.4) −15.5 (− 41.6, 14.9) 0.91 < 0.001
 Water insoluble, g 0.6 (0.1, 1.4) 0.5 (0.07, 1.46) −8.0 (−33.8, 21.1) 0.91 < 0.001
Sodium, mg 322.6 (176, 534.4) 311.7 (170, 535.3) −6.5 (−32.9, 31.5) 0.78 < 0.001
Potassium, mg 175.4 (68.9, 339) 151.5 (62.3, 300) −9.4 (−33.3, 19.1) 0.88 < 0.001
Calcium, mg 25.7 (10.9, 51.7) 23.5 (9, 45.1) −10.4 (−34.5, 21.5) 0.88 < 0.001
Magnesium, mg 15.4 (7.2, 29.7) 16.1 (7, 29.6) −6.7 (−29.2, 22.5) 0.87 < 0.001
Phosphorus, mg 72.6 (28.9, 130.1) 65.8 (28, 129.5) −6.3 (− 29.4, 25.5) 0.86 < 0.001
Iron, mg 0.5 (0.2, 1) 0.5 (0.2, 1) −6.5 (−28.6, 27.2) 0.87 < 0.001
Zinc, mg 0.4 (0.1, 1) 0.4 (0.1, 0.9) −9.1 (− 33.3, 22.7) 0.87 < 0.001
Copper, mg 0.06 (0.02, 0.12) 0.06 (0.01, 0.12) −7.1 (−28.8, 26.4) 0.90 < 0.001
Manganese, mg 0.07 (0.02, 0.26) 0.08 (0.02, 0.24) −7.0 (− 33.3, 27.4) 0.90 < 0.001
Iodine, μg 0.5 (0, 4.08) 0.6 (0, 4.04) −9.5 (−43.0, 67.3) 0.85 < 0.001
Selenium, μg 0.9 (0, 5.4) 1.2 (0, 5.44) −1.5 (−32.2,51.5) 0.92 < 0.001
Chromium, μg 0.2 (0, 0.68) 0.2 (0, 0.68) −8.6 (−41.3, 43.2) 0.88 < 0.001
Molybdenum, μg 3.3 (0, 10.86) 3.3 (0, 10.13) −3.8 (− 32.0, 49.5) 0.89 < 0.001
Retinol, μg 0 (0, 13.15) 0 (0, 7.88) −29.1 (−68.9, 21.8) 0.80 < 0.001
α-carotene, μg 0 (0, 46.91) 0 (0, 4.45) −8.5 (− 65.0, 42.9) 0.78 < 0.001
β-carotene, μg 35 (0, 446.25) 28.5 (0, 540) −11.5 (−51, 27.2) 0.87 < 0.001
Cryptoxanthin, μg 0 (0, 2.19) 0 (0, 2.38) −15.4 (−60.7, 25.0) 0.82 < 0.001
Vitamin D, μg 0 (0, 0.4) 0.03 (0, 0.38) −20.1 (−48.5, 23.1) 0.83 < 0.001
α-tocopherol, mg 0.3 (0.08, 0.86) 0.3 (0.07, 0.88) −6.9 (−34.3, 31.5) 0.91 < 0.001
β-tocopherol, mg 0 (0, 0.05) 0 (0, 0.06) 6.6 (−31.3, 80.0) 0.89 < 0.001
γ-tocopherol, mg 0.3 (0, 1.78) 0.2 (0, 2.25) −1.1 (−33.7, 49.6) 0.87 < 0.001
δ-tocopherol, mg 0.03 (0, 0.4) 0.01 (0, 0.51) 0.0 (−37.7, 75.3) 0.84 < 0.001
Vitamin K, μg 8.5 (0.7, 22.2) 7.5 (0.4, 22) −12.3 (−41.3, 22.5) 0.90 < 0.001
Vitamin B1, mg 0.05 (0.03, 0.11) 0.05 (0.02, 0.1) −9.2 (−34.4, 25.6) 0.87 < 0.001
Vitamin B2, mg 0.06 (0.02, 0.14) 0.05 (0.02, 0.13) −8.3 (−33.3, 20.0) 0.92 < 0.001
Niacin, mg 0.9 (0.2, 2.2) 0.8 (0.2, 2.4) −6.5 (−33.1, 26.8) 0.89 < 0.001
Vitamin B6, mg 0.06 (0.02, 0.15) 0.06 (0.02, 0.16) −7.7 (−33.2, 25.0) 0.87 < 0.001
Vitamin B12, μg 0.3 (0, 0.61) 0.2 (0, 0.52) −11.9 (−42.3, 33.3) 0.86 < 0.001
Folate, μg 18.4 (6.4, 34.9) 17.2 (5.7, 33) −7.4 (−33.8, 24.8) 0.87 < 0.001
Pantothenic acid, mg 0.3 (0.08, 0.75) 0.3 (0.08, 0.7) −9.0 (−31.1, 23.1) 0.89 < 0.001
Biotin, μg 1.4 (0, 3.45) 1.5 (0, 3.67) −0.1 (−31.0, 48.2) 0.87 < 0.001
Vitamin C, mg 3.1 (0, 11.12) 2.6 (0, 9.35) −18.2 (−49.5, 24.1) 0.91 < 0.001
  1. SFA Saturated fatty acid, MUFA Monounsaturated fatty acid, PUFA Polyunsaturated fatty acid
  2. a(food photography method - weighed value) / (weighed value) × 100
  3. bSpearman’s rank correlation coefficient
  4. P value for the correlation