The Behaviour Problems Inventory-Short Form: Reliability and Factorial Validity in Adults with Intellectual Disabilities

Background The Behaviour Problems Inventory‐Short Form (BPI‐S) is a spin‐off of the BPI‐01 that was empirically developed from a large BPI‐01 data set. In this study, the reliability and factorial validity of the BPI‐S was investigated for the first time on newly collected data from adults with intellectual disabilities. Methods The sample consisted of 232 adults with intellectual disabilities who represented all levels of intellectual functioning. They were recruited at several day programs in the USA (n = 148) and the UK (n = 84). Results We found acceptable reliability in terms of internal consistency, inter‐rater agreement and test–retest reliability. Confirmatory factor analysis validated the three BPI‐S subscale structure. Conclusions We corroborated the factor structure underly‐ing the three subscales and found the BPI‐S to have adequate to good psychometric properties in a newly collected sample of adults with intellectual disabilities.