Cover Image
QR Code

Construct validity of the three motor-reduced subscales of the Developmental Test of Visual Perception -- Adolescent and Adult (DTVP-A): a Rasch analysis model evaluation.

Background: The Developmental Test of Visual Perception -- Adolescent and Adult (DTVP-A) is a test used by therapists even though its construct validity has not been thoroughly assessed. Purpose: This study evaluated the scalability/interval level measurement, unidimensionality, lack of differential...

Full description

Published in:British Journal of Occupational Therapy Vol. 74; no. 2; pp. 66 - 78
Main Author: Brown, Ted
Format: research Journal Article
Published: Sage Publications Inc. Feb2011
Online Access:View this record in EBSCOhost
fields @attributes:
  recordID: 1
pdfLink:
plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104822054&site=ehost-live
header:
  @attributes:
    shortDbName: ccm
    uiTerm: 104822054
    longDbName: CINAHL Complete
    uiTag: AN
  controlInfo:
    bkinfo:
    dissinfo:
    jinfo:
      jid:
        03080226
        GZQ
      jtl: British Journal of Occupational Therapy
      issn: 03080226
      maglogo: Y
    pubinfo:
      dt: Feb2011
      vid: 74
      iid: 2
      pid: 344
      pub: Sage Publications Inc.
      place: Thousand Oaks, California
    artinfo:
      ui:
        104822054
        58473369
        58473369
        10.4276/030802211X12971689814007
        104822054
      ppf: 66
      ppct: 12
      formats:
      tig:
        atl: Construct validity of the three motor-reduced subscales of the Developmental Test of Visual Perception -- Adolescent and Adult (DTVP-A): a Rasch analysis model evaluation.
      aug:
        au: Brown, Ted
        affil: Associate Professor and Postgraduate Coordinator, Department of Occupational Therapy, School of Primary Health Care, Faculty of Medicine, Nursing and Health Sciences, Monash University ¿ Peninsula Campus, Building G, 4th Floor, McMahons Road, PO Box 527, Frankston, Victoria 3199, Australia
      sug:
        subj:
          Instrument Validation
          Visual Perception Evaluation
          Clinical Assessment Tools Evaluation
          Human
          Validation Studies
          Construct Validity
          Rasch Analysis
          Clinical Assessment Tools
          Scales
          Cross Sectional Studies
          Convenience Sample
          Data Analysis Software
          Descriptive Statistics
          Female
          Male
          Adult
          Middle Age
          Aged
          Aged, 80 and Over
          Funding Source
          Adult: 19-44 years
          Middle Aged: 45-64 years
          Aged: 65+ years
          Aged, 80 & over
          Female
          Male
      ab: Background: The Developmental Test of Visual Perception -- Adolescent and Adult (DTVP-A) is a test used by therapists even though its construct validity has not been thoroughly assessed. Purpose: This study evaluated the scalability/interval level measurement, unidimensionality, lack of differential item functioning (DIF) and hierarchical ordering of the items of the three motor-free subscales (Figure-Ground, Form Constancy and Visual Closure) of the DTVP-A. Method: The motor-free visual perceptual performance scores from a sample of 221 participants aged 20+ years (49 adults with and 172 adults without neurological impairment) were used to complete a Rasch analysis of the DTVP-A's three motor-free subscales. Results: On the DTVP-A Figure-Ground (FG) subscale, items FG2 and FG6 demonstrated Rasch model misfit, while no item exhibited DIF. On the Form Constancy (FC) subscale, items FC1, FC2, FC4 and FC6 were misfitting, while items FC3 and FC11 exhibited DIF based on gender. Visual Closure (VC) subscale items VC2, VC3, VC13 and VC15 exhibited misfit with the Rasch model requirements, while VC1 and VC5 demonstrated DIF. When all three subscales were analysed together as one Total Motor-Reduced Visual Perception Scale, items FC2, FC1, FC4, VC12, VC15, FC17 and FG6 demonstrated Rasch model misfit, while items VC1, VC2, VC5 and FC11 exhibited DIF based on gender. Conclusion: The construct validity, scalability, hierarchical ordering and lack of DIF requirements were met by the majority of the motor-free DTVP-A items. However, items FG6, FC1, FC2, FC4 and FC11 appeared to be particularly problematic. Given the fact that a number of items exhibited Rasch analysis model misfit or DIF, clinicians need to take this into consideration when using the three motor-free DTVP-A subscales individually or collectively to assess clients.
      pubtype: Academic Journal
      doctype:
        research
        Journal Article
      ougenre: Article
    language: English
    refInfo:
    holdings:
      @attributes:
        islocal: N