Development and Validation of a Brief Age-Normed Screening Tool for Subthreshold Psychosis Symptoms in Youth.

Background and Hypothesis Improvements in screening tools for early subthreshold psychosis symptoms are needed to facilitate early identification and intervention efforts, especially given the challenges of rapidly differentiating age-appropriate experiences from potential early signs of emerging psychosis. Tools can be lengthy and time-consuming, impacting their utility and accessibility across clinical settings, and age-normed data are limited. To address this gap, we sought to develop and validate a brief, empirically derived, age-normed, subthreshold psychosis screening tool, for public use.Study Design Computerized adaptive test simulation was used to derive a 5-item short form with age norm equivalencies from a 12-item PRIME-Screen-Revised (PRIME-12) administered to 7053 youth (Mage = 15.8, SD = 2.7; 54% female; 33% Black). Concurrent validity was assessed (n = 758) using contemporaneous administration of the PRIME-5 and the Structured Interview for Prodromal Syndromes. Comparability of criterion-related validity of the PRIME-5, PRIME-12, and Scale of Prodromal Symptoms (SOPS) was assessed by relating scores to psychosis-risk-relevant criteria. Finally, self-report versus assessor-administered PRIME total scores were compared (n = 131) to assess their concurrent validity.Study Results Correlations among PRIME-5, PRIME-12, and SOPS were comparable and moderate, supporting their convergent validity. The PRIME-5 also showed comparable criterion-related validity, demonstrating similar relationships with psychosis-risk indicators as the other tools. Self-reported and assessor-administered PRIME-5 were moderately correlated.Conclusions Public availability of a brief, age-normed, and validated screening tool-which can be assessor or self-administered-will expedite and improve early identification of youth (age 11 and older) at risk for psychosis.