“…On the basis of frequencies and serving sizes, nutrient contributions of the food items on a daily basis were calculated, summed, and then converted to percentages of the 1974 recommended dietary allowances (RDA) for six nutrients: protein, calcium, iron, vitamin A, thiamine, and ascorbic acid. These nutrients, except for protein, were selected as indicators of diet quality because earlier studies conducted in the North Central Region indicated that respondents were most likely to be deficient in these nutrients (Eppright, 1950;Swanson, Willis, Jebe, Smith, Ohlson, Biester, and Burrill, 1959;Pearson, 1971). On the basis of percentage of RDA, each of the six nutrients was given a rating as follows: 3 = 100 percent, or more, RDA; 2 = 67 to 99.9 percent RDA; 1 = less than 66.9 percent of RDA.…”