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Comparisons of the percentages of social play categories within age and sex groups pairewise t-tests: From the age of 45 years, children's sociality changed abruptly, notably associative play predominated at 45 years and cooperative play predominated at 56 years.
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To this end, children's play behavior was observed under naturalistic conditions at nursery schools during self-selected activities and spontaneous peer-groups. Discrepancies between studies undoubtedly feed the continuing debate. Finally, a variety of clinical conditions with marked social deficits, such as autism, occurs more often in males than in females, and has been described as an extreme manifestation of some male-typical traits, suggesting a continuum between typical and atypical social development . Beyond a great heterogeneity in methodologies, whether studies found differences or not seems dependent on children's ages.
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Following a cross-sectional design, children aged from 2 to 6 years old, divided into four age groups, were observed during outdoor free play at nursery school. There is some evidence in support of this view. Comparisons of the percentages of social play categories within age groups pairewise t-tests: Females display more emotional expression and are more skilled at decoding others' emotions  ,  and understanding others' thoughts  .
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Some studies found no sex differences whereas others reported differences that were either congruent or not with gender stereotypes. Comparisons of the percentages of social play categories within age and sex groups pairewise t-tests: Girls' and boys' social participation profiles over the preschool period.
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Among available peer play scales, we adapted the seminal Parten's  framework which covers the social spectrum of children's participation in peer play, with non-social activities: To this end, children's play behavior was observed under naturalistic conditions at nursery schools during self-selected activities and spontaneous peer-groups.
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