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close this book Food Composition Data: A User's Perspective (1987)
close this folder Other considerations
close this folder Consideration of food composition variability: What is the variance of the estimate of one-day intakes? Implications for setting priorities
View the document (introductory text)
View the document Introduction
View the document Magnitude of the reported variability of composition
View the document Impact of composition variation on a one-day food intake
View the document Additional impact of a random error in intake estimation
View the document Some implications for data analyses
View the document Validation of food intake data: implications of food composition variation
View the document Systematic errors in food composition data
View the document Relevance to priorities for food composition data
View the document Conclusions
View the document References

Impact of composition variation on a one-day food intake

Impact of composition variation on a one-day food intake

To assess the impact of this variation on the estimate of intake of an adult for one day, two sample diets, identified in tables 2 and 3 as HW1 and HW2, were taken from recorded foodintake studies. (The compositions of these diets can be found in the National Academy of Sciences report [6].) For each food and nutrient in these diets the CV of composition was either generated from the food composition table or, if the table presented no SE estimates, it was imputed, selecting a random value from the ranges suggested in table 1. Thus, for every food and nutrient in the two records, a mean and CV of composition was generated. The SD of composition was thus available as well.

Table 2. Food composition and variability estimates associated with food record HWIa

Food item (g) Weight eaten (g) Composition per 100 8 (percentages given in parentheses)
Protein (mg) Calcium (mg) Iron (mg) Magnesium (mg) Sodium (mg) Zinc (mg) Vitamin C (mg) Thiamine (mg) Riboflavin (mg) Niacin (mg) Vitamin B6 (mg) Folate (mg) Vitamin A (IU)
Orange juice 124.0 0.68 9.0 0 10 10.0 1.0 0.05 38.9 0.079 0.018 0.202 0.044 43.8 78.0
    (0.6) (15.3) (64.1) (8.9) (158.3) (43.4) (13.5) (21.9) (00) (10.6) (0.0) (18.0) (26.1)*
Scrambled egg 64.0 9.32 74.0 1.46 12.0 242.0 1 10 0.2 0.061 0.243 0.066 0.091 35.0 486.0
    (14.9)* (13.1)* (29.3)* (21.4)* (8.3)* (28.1)* (28.3)* (18.3)* (18.7)* (52.0)* (21.2)* (28.0)' (143)*
Sausage 26.0 13.80 0.0 1.13 12.0 805.0 1.87 0.0 0.357 0.147 3.367 0.050 0.0 0.0
    (13 4) (-) (15 4) (18 8) (7 5) (14 3) (-) (13.7) (11.7) (9 2) (29.4) (-) (-)
Shredded wheat 28 4 11.00 38.0 4.22 132.0 10.0 3.30 0.0 0.260 0.280 5.25 0.253 50.0 0.0
    (3.5) (15.8) (12.7) (15.0) (93.0) (14.0) (-) (11.7) (53.5) (7 7) (9.6) (16.2) (-)
Milk, whole 122 0 3.29 119.0 0.05 13.0 49.0 0.38 0.94 0.038 0.162 0.084 0.042 5.0 126.0
    (5.3) (6 9) (44.3) (37.4) (16.3) (16.2) (50.2) (27 6) (14.0) (15.7) (49.4) (28 3) (34.5)
Coffee whitener 15.0 1.00 9 0 0.03 0.0 79 0 0.02 0.0 0.0 0.0 0.0 0.0 0.0 89.0
    (44.2) (62.9) (223.6) (-) (60.9) (25.3) (-) (-) (-) (-) (-) (-) (82.9)
Tomato soup 248.0 2.46 64.0 0.73 9.0 376.0 0.117 27.3 0.054 0.100 0.613 0.066 8.4 342.0
    (7.2)* (14.6)* (58.5)* (11.8)* (11.4)* (27.5)* (11.2)* (12.6)* (16.8)* (12.9)* (18.6)* (37.1)* (11.0)*
Frankfurters 90.0 11.28 11.0 1.15 10.0 1,120.0 1.84 26.0 0.199 0.120 2.634 0.130 4.0 0.0
    (5.2) (2.0) (29.3) (9.8) (8.4) (14.0) (25 3) (33.2) (22.1) (13.6) (30.6) (32.5) (-)
Cheddar cheese 28.0 24.90 721.0 0.68 28.0 620.0 3.11 0.0 0.027 0.375 0.080 0.070 18.0 1,059.0
    (7.2) (8.6) (25.1) (19.6) (16.7) (21.4) (-) (55.0) (24.9) (67.6) (46.2) (55.8) (25.2)
Peach 87.0 0.70 5.0 0.11 7.0 0.0 0.14 6.6 0.017 0.041 0.990 0.018 3.4 535.0
    (20.0) (47 7) (83 3) (27 3) (-) (59.1) (37 8) (35.3) (19.5) (4.4) (23.6) (28.2) (10.2)
Milk shake 313.0 3.96 146.0 0.10 12.0 95.0 0.39 0.0 0.030 0.195 0.146 0.042 7.0 114.0
    (8.0) (12.6) (19.9) (13 4) (7 3) (31. 5) (-) (33 9)* (25.3)* (22.0)* (44.3)* (55.1)* (18.1)*
Potato soup 248.0 2.37 67.0 0.22 7.0 428.0 0.272 0.5 0.033 0.095 0.259 0.036 3.7 179.0
    (10.8)* (14.8)* (38.4)* (34.2)* (5.4)* (55 0)* (16.1)* (34 0)* (21.0)* (19.0)* (14 7)* (30.2)* (36.6)*
Pork chops 126.0 28.82 15.0 0.81 30.0 67.0 2.38 0.3 0.894 0.323 5.231 0.400 4.0 6.0
    (16.3) (21.8)* (16.7) (23.7) (6.3) (14.6) (28.3) (32.6) (20.4) (11.9) (19.0) (38.3)* (6.2)*
Fruit cocktail 122.0 0.42 5.0 0.25 7.0 40 0.09 2.1 0.016 0.011 0.363 0.052 0.0 250.0
    (7.4) (9.0) (40.4) (8.8) (48.4) (29.4)* (336) (19.8) (-) (21.9) (29.9)* ( ) (23.2)
Skim milk 245.0 3.41 123.0 0.04 11.0 52.0 0.40 0.98 0.036 0.;40 0.088 0.040 5.0 204 0
    (4.3) (13 3) (38.2) (17.0) (27 1) (36.9)              
Number of items with imputed CV (*)   3 4 3 3 3 5 3 4 4 4 5 5 6

a. CV values are shown below average composition.

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