title: The construct validity of the Dutch version of the activity card sort.
abstract: Establishing construct validity of the ACS-NL in individuals with Parkinson's disease (PD).
  
  
  
  Discriminative validity was established in 191 community-dwelling individuals with PD using an extreme groups design (Hoehn and Yahr stages 1 and 3). Convergent validity was determined by relating the performance scores of the ACS-NL to the scores of the Canadian Occupational Performance Measure (COPM) and the Parkinson's Disease Questionnaire (PDQ-39) scores, and relating ACS-NL satisfaction scores to the COPM scores and to the Utrecht Scale for Evaluation of Rehabilitation Participation (USER-P).
  
  
  
  The ACS-NL discriminated between individuals with PD with H&Y stages 1 and 3 (U = 524.5, Z = -5.453). ACS-NL performance scores correlated weakly with COPM scores (r = (0).19) and moderately with PDQ-39 scores (r = 0.44-0.55). The ACS-NL satisfaction scores correlated weakly with COPM scores (r = 0.23), and moderately with USER-P scores (r ≥ 0.40).
  
  
  
  This study contributed to the validation of the ACS-NL. The assessment enhances the possibility of monitoring participation in activities in individuals with PD. Implications for Rehabilitation The ACS-NL appears to hold good potential for use in the assessment of participation in activities in individuals with PD. The ACS-NL has added value parallel to administration of other instruments measuring participation (COPM) and quality of life (PDQ-39). This study demonstrates the capacity of the ACS to measure a unique construct of participation and helps to improve the psychometric properties and administration of the ACS-NL in practice.
authors.affiliation: a Hogeschool Van Amsterdam, Occupational Therapy Research Group, University of Applied Sciences , Amsterdam , The Netherlands ;
authors.forename: Soemitro J
authors.initials: SJ
authors.lastname: Poerbodipoero
authors.affiliation: b Department of Rehabilitation , Radboud University Medical Centre , Nijmegen , The Netherlands ;
authors.forename: Ingrid H
authors.initials: IH
authors.lastname: Sturkenboom
authors.affiliation: a Hogeschool Van Amsterdam, Occupational Therapy Research Group, University of Applied Sciences , Amsterdam , The Netherlands ;
authors.forename: Margo J
authors.initials: MJ
authors.lastname: van Hartingsveldt
authors.affiliation: b Department of Rehabilitation , Radboud University Medical Centre , Nijmegen , The Netherlands ;|c Radboud University Medical Centre, Scientific Institute for Quality of Healthcare , Nijmegen , The Netherlands.
authors.forename: Maria W G
authors.initials: MW
authors.lastname: Nijhuis-van der Sanden
authors.affiliation: b Department of Rehabilitation , Radboud University Medical Centre , Nijmegen , The Netherlands ;|c Radboud University Medical Centre, Scientific Institute for Quality of Healthcare , Nijmegen , The Netherlands.
authors.forename: Maud J
authors.initials: MJ
authors.lastname: Graff
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D057187:Independent Living; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009426:Netherlands; D009788:Occupational Therapy / Q000379:methods; D010300:Parkinson Disease / Q000534:rehabilitation*; D011594:Psychometrics / Q000379:methods*; D011788:Quality of Life / Q000523:psychology*; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires
keywords: ACS; ICF; Parkinson’s disease; activity; occupational therapy; participation