title: Functional Impairment in Children With Externalizing Behavior Disorders: Psychometric Properties of the Weiss Functional Impairment Rating Scale-Parent Report in a German Clinical Sample.
abstract: To examine the psychometric properties of a German adaptation of the Weiss Functional Impairment Rating Scale-Parent Report (WFIRS-P) in a clinical sample of children (4-12 years) with externalizing behavior disorders.
  
  
  
  Data were collected within two clinical trials (N = 264). Factorial validity, reliability, and divergent validity from symptoms of ADHD and oppositional defiant disorder (ODD) were assessed.
  
  
  
  Confirmatory factor analyses revealed that a bifactor model consistent with the theoretical assumption of a general construct of impairment (total scale) and additional specific factors (subscales) provided satisfactory data fit. Model-based reliability estimates showed that both the general construct and specific factors accounted for item variance. Internal consistencies were >.70, part-whole corrected item-scale correlations mostly >.30. Correlations between the WFIRS-P Scales and ADHD and ODD symptoms were low to moderate.
  
  
  
  The results support the factorial validity, reliability, and divergent validity of the WFIRS-P.
authors.affiliation: Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, Medical Faculty of the University of Cologne, Germany.
authors.forename: Christina
authors.initials: C
authors.lastname: Dose
authors.affiliation: School for Child and Adolescent Cognitive Behavior Therapy at the University of Cologne.
authors.forename: Christopher
authors.initials: C
authors.lastname: Hautmann
authors.affiliation: Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, Medical Faculty of the University of Cologne, Germany School for Child and Adolescent Cognitive Behavior Therapy at the University of Cologne Manfred.Doepfner@uk-koeln.de.
authors.forename: Manfred
authors.initials: M
authors.lastname: Doepfner
keywords: Weiss Functional Impairment Rating Scale; children; externalizing behavior disorders; functional impairment; psychometric properties