title: Occupational abilities and performance scale--reliability-validity assessment factor analysis.
abstract: BACKGROUND
  This article presents a study of the Occupational Abilities and Performance Scale (OAPS), developed for administration to schizophrenic patients. The reliability and validity of the OAPS has been evaluated.
  
  
  METHODS
  A total of 174 schizophrenic patients who participated in the Psychosocial and Vocational Rehabilitation Unit (PVRU) of the University Mental Health Research Institute (UMHRI) in Athens were assessed. The OAPS is conducted at entry and after 18 months, when the client has completed training.
  
  
  RESULTS
  The results of the reliability analysis showed very good internal consistency, with high split-half reliability as well as test-retest reliability and inter-rater agreement. The scale was also found to have good predictive validity, as well as concurrent validity. Finally, factor analysis with principal components extraction method was performed in order to assess the construct validity of the scale.
  
  
  CONCLUSIONS
  The results of factor analysis supported the conclusion of good reliability and validity of the OAPS and revealed the existence of five components, each correlated with a set of the original items.
authors.affiliation: Psychosocial Vocational Rehabilitation Unit, University Mental Health Research Institute, Argyrokastrou & Ionias strs., 66517, 15601, Papagou, Athens, Greece. monakopat@epipsi.gr
authors.forename: M V
authors.initials: MV
authors.lastname: Karidi
authors.forename: K
authors.initials: K
authors.lastname: Papakonstantinou
authors.forename: N
authors.initials: N
authors.lastname: Stefanis
authors.forename: M
authors.initials: M
authors.lastname: Zografou
authors.forename: G
authors.initials: G
authors.lastname: Karamouzi
authors.forename: P
authors.initials: P
authors.lastname: Skaltsi
authors.forename: N
authors.initials: N
authors.lastname: Tsinia
authors.forename: C
authors.initials: C
authors.lastname: Christidou
authors.forename: A
authors.initials: A
authors.lastname: Rabavilas
authors.forename: C N
authors.initials: CN
authors.lastname: Stefanis
mesh_terms: D000328:Adult; D001076:Aptitude; D003131:Combined Modality Therapy; D004650:Employee Performance Appraisal / Q000706:statistics & numerical data*; D004651:Employment; D005163:Factor Analysis, Statistical; D005260:Female; D005500:Follow-Up Studies; D006115:Greece; D006801:Humans; D008297:Male; D011581:Psychological Tests / Q000706:statistics & numerical data*; D011594:Psychometrics / Q000706:statistics & numerical data; D012050:Rehabilitation, Vocational; D015203:Reproducibility of Results; D012559:Schizophrenia / Q000534:rehabilitation*; D016896:Treatment Outcome