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Frisch has drawn attention to the role of fatness as a determinant of the onset and maintenance of menses. Her index of fatness, upon which her conclusions rest, contains such a large component of error that it cannot serve as an accurate measure of fatness. Hence, claims about the role of fatness cannot be supported. Specifically, the procedure for estimating age at menarche, which is based on first classifying girls into quartiles of fatness, can be shown to be useless.