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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