O10.5. CLINICAL HIGH RISK (CHR) CRITERIA IN CHILDREN AND ADOLESCENTS NOT SUSPECTED TO DEVELOP PSYCHOSIS: NO TRANSDIAGNOSTIC SEVERITY MARKER OF MENTAL HEALTH PROBLEMS

BACKGROUND: Compared to adults, children and adolescents of the community more frequently report clinical high risk of psychosis (CHR) criteria. Yet, little is known about the prevalence of CHR criteria in clinical children and adolescents’ samples. Thus, we studied the prevalence of CHR criteria and symptoms in 8- to 17-year-old inpatients with disorders that have been associated with greater odds to develop psychosis in adulthood, i.e., attention-deficit hyperactivity disorder, social and specific phobia, and obsessive-compulsive disorder, eating disorders and Asperger’s disorder. METHODS: As part of the multicenter naturalistic Bi-national Evaluation of At-Risk Symptoms in children and adolescents (BEARS-Kid) study, 8- to 17-year-olds of the community (N=235) and 8- to 17-year-old inpatients with any one of the above main diagnoses who were not suspected to be at increased risk of psychosis (N=306) were examined for CHR symptoms and criteria with the Schizophrenia Proneness Instrument, Child & Youth version and with the Structured Interview for Psychosis-Risk Syndromes. RESULTS: At 6.4%, the prevalence rate of CHR criteria in the community sample did not significantly differ from the 8.2%-rate in the inpatient sample. CHR criteria and symptoms were generally associated with age but not with group membership. DISCUSSION: This indicates that, irrespective of their mental health status, children and adolescents present more frequently with CHR criteria compared to young adults of the community for whom a 2.4%-rate of CHR criteria had earlier been reported. Furthermore, these findings contradict assumptions that CHR criteria might be diagnostically puripotential or merely severity markers of mental illness. Yet, more research into these symptoms and their cause and meaning in children and adolescents is needed to understand their significance in this age group and to detect factors that convey their clinical relevance in adulthood.