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Social and structured forms of play emerge systematically earlier in girls than in boys leading to subsequent sex differences in favor of girls at some ages, successively in associative play at 3—4 years, cooperative play at 4—5 years, and social interactions with peers at 5—6 years.
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It is well documented that with increasing age, children are more likely to engage in social play, proceeding from less to more mature forms of social interactions  ,  ,  , .
Description: Table S4: Girls' and boys' social participation profiles over the preschool period.