The study found that the B-CAP is a highly reliable and precise measure of paranoia across a wide range of symptom severity in adolescents. All items effectively distinguished between different levels of paranoia and functioned consistently across gender, age, and clinical versus non-clinical groups. The findings also demonstrated the potential for computerised adaptive testing, allowing accurate assessment with fewer questions. Overall, the B-CAP provides a robust tool for identifying and measuring paranoid thoughts in young people, with potential applications in both research and clinical settings.