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Cohen's kappa statistics for each social category ranged from 0. J Abnorm Soc Psychol. Detecting the presence or absence of the Y chromosome ultimately reveals the sex. Both the amount and the quality of children's play are associated with measures of social motivation and competence, in particular with peers [28] — [30]. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. Introduction Human sex differences are a perennially hot topic that not only grips the public interest, but that has triggered a great deal of scientific focus from biological to social sciences. While boys catch up and same-age girls move on towards more complex social play and interactions, a sex difference recorded in favour of girls in a particular social play pattern at a given age can be reversed the following year, as we evidenced for associative and cooperative play.

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The adult-children ratio was approximately the same in all playgrounds and schools as teachers accompanied their classes.

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The children's activities were recorded every 2 minutes during playtime that lasted on average 30 minutes. They were unaware of the purpose of the study i. Therefore, early sex differences in interests may impact upon the evaluation of children's play quality and related social and socio-cognitive skills. Discrepancies between studies undoubtedly feed the continuing debate. The positioning of baby in the womb becomes important as your due date approaches. Thus, the magnitude, consistency and stability across time of between-sex differences remain questioned [5][6][18].

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