Refinement of the Reflective Function Questionnaire for Youth (RFQY) Scale B Using Item Response Theory

We conducted item response theory analyses to refine the Reflective Function Questionnaire for Youth (RFQY) Scale B. Data from a non-clinical sample of young people ( n = 737; aged 18-25 years) was used to derive a shortened version of the RFQY. Results were replicated in a clinical sample of inpatient adolescents ( n = 467; aged 12-17 year), resulting in a five-item measure, thereafter named the RFQY-5. The RFQY-5 item set was then scrutinized...