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Comparisons of the percentages of social play categories within age and sex groups pairewise t-tests: From the age of 4—5 years, children's sociality changed abruptly, notably associative play predominated at 4—5 years and cooperative play predominated at 5—6 years.

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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 [13] , [14] and understanding others' thoughts [15] — [17].

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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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