Data on the frequencies of certain feminine-type symptoms in two groups of boys, numbering 84 and 95 each, were obtained from their parents. These frequencies were much lower than those in a comparable group of 26 effeminate boys. The individuals of the non-effeminate group who did show possible symptoms generally had fewer of them than did the individual effeminate boys. A shorter duration and other characteristics of the symptoms usually clearly differentiated the non-effeminate from the effeminate boys.
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Zuger et al. (1969) studied this question.