title: The continuity between DSM-5 obsessive-compulsive personality disorder traits and obsessive-compulsive symptoms in adolescence: an item response theory study.
abstract: OBJECTIVE
  Various studies have shown that obsessive-compulsive symptoms exist as part of not only obsessive-compulsive disorder (OCD) but also obsessive-compulsive personality disorder (OCPD). Despite these shared characteristics, there is an ongoing debate on the inclusion of OCPD into the recently developed DSM-5 obsessive-compulsive and related disorders (OCRDs) category. The current study aims to clarify whether this inclusion can be justified from an item response theory approach.
  
  
  METHODS
  The validity of the continuity model for understanding the association between OCD and OCPD was explored in 787 Dutch community and referred adolescents (70% female, 12-20 years old, mean = 16.16, SD = 1.40) studied between July 2011 and January 2013, relying on item response theory (IRT) analyses of self-reported OCD symptoms (Youth Obsessive-Compulsive Symptoms Scale [YOCSS]) and OCPD traits (Personality Inventory for DSM-5 [PID-5]).
  
  
  RESULTS
  The results support the continuity hypothesis, indicating that both OCD and OCPD can be represented along a single underlying spectrum. OCD, and especially the obsessive symptom domain, can be considered as the extreme end of OCPD traits.
  
  
  CONCLUSIONS
  The current study empirically supports the classification of OCD and OCPD along a single dimension. This integrative perspective in OC-related pathology addresses the dimensional nature of traits and psychopathology and may improve the transparency and validity of assessment procedures.
authors.affiliation: Department of Developmental, Personality and Social Psychology, Ghent University, Henri Dunantlaan 2, B-9000 Ghent, Belgium Elien.DeCaluwe@UGent.be.
authors.forename: Elien
authors.initials: E
authors.lastname: De Caluwé
authors.forename: David C
authors.initials: DC
authors.lastname: Rettew
authors.forename: Barbara
authors.initials: B
authors.lastname: De Clercq
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003193:Compulsive Personality Disorder / Q000145:classification*; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D006801:Humans; D008297:Male; D009771:Obsessive-Compulsive Disorder / Q000145:classification*; D011582:Psychological Theory; D055815:Young Adult