A Study of the Endogenous Nitrogen Output of College Women, with Particular Reference to Use of the Creatinine Output in the Calculation of the Biological Values of the Protein of Egg and of Sunflower Seed Flour

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Abstract
Data from studies during three consecutive years have been combined in a study of the endogenous metabolism of women 19 to 30 years of age. Twenty-five subjects participated in the entire study. In addition, biological values were determined for sunflower seed flour and for whole egg. The results were as follows: For these subjects, expression of the endogenous nitrogen as a multiple of urinary creatinine reduced the variation between individual values more than when body weight, surface area or basal metabolism served as a basis of expression, as evidenced by the coefficients of variation for the mean values. The differences between the coefficients proved significant only in a comparison of the creatinine expression with that for body weight. On the basis of the data herein reported, the authors recommend use of values for endogenous nitrogen derived from creatinine nitrogen × 3.984 only in estimation of the biological values and nitrogen minima of adult female populations. It is planned to test this factor with other segments of the population.