In this proposed study, Text messages are used to intervene in the NSSI behavior of adolescents, and the efficacy of this intervention method is evaluated, as well as the internal mechanism of adolescents' NSSI behavior is discussed.
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
The change of NSSI behavior of the participants.
Timeframe: At baseline, the fourth week, the eighth week