Investigation of the Trend in Adolescent Mental Health and its Related Social Factors: A Multi-Year Cross-Sectional Study For 13 Years.

Change of Prevalence for Mental Health Outcome Variables at Each Year The yearly prevalence of mental health outcome variables such as the depressive episode, suicidal ideation, suicidal attempt, and subjective unhappiness proportion tended to considerably drop during the study period despite a slightly increasing trend since 2015 ( Figure 1 and Tables S2 and S3 ).

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