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Background Internet is gradually reshaping adolescents’ behaviors in China. It is important to identify the prevalence and risk factors to predict Internet addiction among adolescent psychiatric patients. Methods The survey was conducted among inpatient or outpatient adolescent patients with mental disorders. All participants were interviewed face-to-face and completed Young Internet Addiction Test and other relevant assessments. Binary logistic regression analysis was used to exam between-group differences of internet addiction. Result The prevalence for internet addiction (mild to severe) in adolescent psychiatric patients was 80.2%, where the prevalence for “medium and severe internet addiction was 25.5%. Logistic regression analysis identified two independent predictors for “medium and severe internet addiction” including the total score of Adolescent Non-suicidal-self-injury (NSSI) Behavior Function Assessment Scale (ANBFAS) and the diagnosis of generalized anxiety disorder (GAD) (R2 =0.27, p = .02 for total ANBFAS score, p = .01 for GAD) in psychiatric adolescent patients. Conclusion The prevalence of internet addiction is notably high among adolescent psychiatric patients in China. Coping for Internet addiction in adolescent psychiatric patients should conclude the coping of NSSI and GAD.

Background: Non-suicidal self-injury (NSSI), as a major public health issue of high complexity, multifactorial causes and great socioeconomic and family impact, affects China now especially after COVID-19. The aim of this study was to explore the clinical and psychological characteristic in adolescent psychiatric patients with or without NSSI.Methods: Adolescent psychiatric patients were recruited from psychiatric outpatient and inpatient unit in Guangdong mental Health Center between October and December 2020. NSSI was evaluated by the modified version of Adolescents Self-Harm Scale. Childhood trauma was assessed by the Childhood Trauma Questionnaire-Short Form (CTQ-SF). Peer bullying experience was evaluated by The Revised Olweus Bully/Victim Questionnaire（BVQ-R). Depression was assessed by the Montgomery–Asberg Depression Rating Scale (MADRS). Clinical data were collected from electronic medical record system.Results: The sample included 157 adolescent psychiatric patients (72.6% female), aged 13-18 years (M=15.39, SD=0.145). NSSI group experienced more peer bullying (t=4.08,P＜0.001), more likely to get into romantic relationship currently(χ2=5.38, P=0.02), more times of hospitalization (t=0.36, PPP＜0.001), and mood-stabilizer treatment (χ2 =8.53, PConclusions: Adolescent psychiatric patients with NSSI have significantly higher incidences of life event such as peer bulling, childhood trauma experience, and they were more likely to get into a romantic relationship. Meanwhile, patients with NSSI had significantly severe level of depression, being more on benzodiazepine and mood-stabilizer use. This provides a valuable basis for our clinical treatment of adolescent mental patients with NSSI.