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Critical Weight at Menarche

ROSE E. FRISCH, PHD
Am J Dis Child. 1975;129(2):258-259. doi:10.1001/archpedi.1975.02120390082021.
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Sir.—This is in reply to the article by Johnston et al, which appeared in the January issue of the Journal (129:19, 1975).

I was very pleased to note their confirmation for Philadelphian and Guatemalan girls of our basic finding that the mean weight of early- and late-maturing girls at menarche does not differ significantly. The confirmation from the data of the Guatemalan girls is especially interesting, since Guatemalan girls have a different critical weight at menarche, ie, 39 kg (86 lb) as we have shown is expected in differing racial groups,1 and as we have already pointed out to Dr. Johnston and associates in our reply to their first critical comment.2

Unfortunately, the discussion by Dr. Johnston and co-workers of the Frisch-Revelle data contains many mistatements of fact and important omissions, which I would like to correct.

  1. It is an obvious absurdity to think we ever

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