中国基于学校的标准多模式青少年自杀预防项目：一项群随机对照试验方案

Suicide among adolescents is a critical global public health concern and ranks among the top three causes of death for this age group. Globally, more than 700,000 people die by suicide each year across all age groups. In China, this issue has also drawn growing societal attention, particularly in high-resource metropolitan areas, where mental health has become a priority on the educational agenda. Consequently, schools in these regions have pioneered diverse mental health promotion projects and established various psychological education curricula, creating a unique opportunity to implement an