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Reliability was assessed through composite reliability scores. Measurement invariance across subgroups was also assessed. The original five-factor (i.e., emotional symptoms, conduct problems, peer problems, hyperactivity and prosocial behaviour) SDQ fit the data satisfactorily, demonstrated evidence of reliability, and was invariant across sex (male vs. female), age (children vs. adolescents) and survey language (English vs. French). The higher-order solution fit the data acceptably, and the three-factor solution d