Across the globe, social workers serve schools in a variety of capacities, providing services such as skills training; individual, group, and family counseling; crisis intervention; home visits; parent support and education; and advocacy for students, families, and school systems. To date, no synthesis of the literature exists examining tier 1 and tier 2 cross-national school-based social work interventions. Therefore, the purpose of this systematic review was twofold: (1) to identify tier 1 and tier 2 school-based interventions that involve social workers and (2) to examine the extent to which the interventions are efficacious with school-based youths. A computerized search with inclusion and exclusion criteria was conducted using several databases. Eighteen studies were included for the final sample in this review. Effect sizes were calculated for all outcomes to determine magnitude of treatment effect.
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