title: The Behaviour Problems Inventory-Short Form: Reliability and Factorial Validity in Adults with Intellectual Disabilities.
abstract: 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.
authors.affiliation: George Mason University, Fairfax, VA, USA.
authors.forename: Andréa N
authors.identifier: http://orcid.org/0000-0002-6769-9384
authors.initials: AN
authors.lastname: Mascitelli
authors.affiliation: George Mason University, Fairfax, VA, USA.
authors.forename: Johannes
authors.initials: J
authors.lastname: Rojahn
authors.affiliation: George Mason University, Fairfax, VA, USA.
authors.forename: Vias C
authors.initials: VC
authors.lastname: Nicolaides
authors.affiliation: Chrestomathy Inc., Eden Prairie, MN, USA.
authors.forename: Linda
authors.initials: L
authors.lastname: Moore
authors.affiliation: University of Warwick, Coventry, UK.
authors.forename: Richard P
authors.initials: RP
authors.lastname: Hastings
authors.affiliation: Bangor University, Bangor, UK.
authors.forename: Ceri
authors.initials: C
authors.lastname: Christian-Jones
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000374:Aggression / Q000523:psychology; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000175:diagnosis* / Q000523:psychology*; D008297:Male; D008875:Middle Aged; D000066553:Problem Behavior / Q000523:psychology*; D011594:Psychometrics; D015203:Reproducibility of Results; D016728:Self-Injurious Behavior / Q000175:diagnosis / Q000523:psychology; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires / Q000592:standards*; D006113:United Kingdom; D014481:United States; D055815:Young Adult
keywords: aggression; assessment; behavior problems inventory; intellectual disability; psychometric; self-injurious behavior