Abstract
Mental disorders are a leading cause of disease burden worldwide. As onset typically occurs in adolescence, prevention during this period is critical. The Health4Life-school-based multiple health behavior change (MHBC) intervention targets six lifestyle risk factors: diet, sleep, physical activity, screentime, alcohol use and smoking. Health4Life has been evaluated in a cluster-randomized controlled trial in 71 Australian schools (6,639 grade seven students). This study presents intervention effects on secondary outcomes of depressive, anxiety and psychological distress symptoms. Generalized linear mixed-effect analyses of data from baseline, post-intervention (7 weeks), 12 months and 24 months showed that the Health4Life intervention was no more effective than an active control in reducing depressive, anxiety or psychological distress symptoms at a 24 or 12 month follow-up; however, there were short-term benefits for psychological distress and depressive symptoms immediately post-intervention. This study offers new evidence that multiple health behavior change interventions may improve adolescent mental health, but future research should explore methods to address anxiety and sustain effects over the longer term. A priori ANZCTR trial registration: ACTRN12619000431123.
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