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This study examined cross-national gender differences from early, middle and late childhood. Using a meta-analytic approach based on mean values, standardization data from the Strengths and Difficulties Questionnaire (Subscale Hyperactivity\/Inattention) from England, the Netherlands, the USA, and Japan were aggregated. A mixed-effects meta-regression model was used to average gender differences and potential moderation by age group and the Gender Inequality Index (GII) simultaneously. The gender difference was significant overall (standardized mean differences [SMD] \u2248 0.27) and in all age groups (SMD early childhood \u2248 0.27, SMD middle childhood \u2248 0.36, SMD late childhood\/adolescence \u2248 0.35). The GII did not explain the observed variability but was limited in variance. Residual heterogeneity suggests the involvement of additional factors. Results indicate that gender differences are existing in all age groups and countries. Limitations include the use of aggregated data, categorical age groups, and a small number of countries.<\/jats:p>","DOI":"10.1007\/s10578-026-02074-8","type":"journal-article","created":{"date-parts":[[2026,8,8]],"date-time":"2026-08-08T03:56:10Z","timestamp":1786161370000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Boys Score Higher Everywhere? 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