What type of study is this?

This is a Quasi-Experimental study.

A brief positive psychology intervention implemented in schools: a quasi-experimental pilot study on its impact on early and middle adolescents’ mental health

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Quasi-experimental pilot study shows improved mental health outcomes in adolescents, highlighting the need for school-based interventions.

The positive psychology intervention significantly increased self-esteem and positive affect among early and middle adolescents.
Intervention participants reported reductions in anxiety compared to control groups during the study period.
The study utilized a quasi-experimental design, comparing outcomes between 133 students in intervention and 57 in control groups.
Findings indicate that school-based mental health interventions can effectively support adolescents, especially during global crises.

Tejada‐Gallardo et al. (2025) studied this question.

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Quasi-experimental pilot study shows improved mental health outcomes in adolescents, highlighting the need for school-based interventions.