Changes in USDA Food Composition Data for 43 Garden Crops, 1950 to 1999

@article{Davis2004ChangesIU,
  title={Changes in USDA Food Composition Data for 43 Garden Crops, 1950 to 1999},
  author={Donald R. Davis and Melvin D. Epp and Hugh D. Riordan},
  journal={Journal of the American College of Nutrition},
  year={2004},
  volume={23},
  pages={669 - 682}
}
OBJECTIVES To evaluate possible changes in USDA nutrient content data for 43 garden crops between 1950 and 1999 and consider their potential causes. [] Key Method To evaluate R-values for individual foods and nutrients, with hypothetical confidence intervals, we use USDA's standard errors (SEs) of the 1999 values, from which we generate 2 estimates for the SEs of the 1950 values. RESULTS As a group, the 43 foods show apparent, statistically reliable declines (R < 1) for 6 nutrients (protein, Ca, P, Fe…
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