Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Maintaining instrument quality while reducing items: application of Rasch analysis to a self-report of visual

C A Velozo1, J S Lai, T Mallinson

  • 1Department of Occupational Therapy, University of Florida, Gainesville 32610-0164, USA.

Journal of Outcome Measurement
|March 20, 2001
PubMed
Summary

Rasch analysis efficiently reduced the Visual Function-14 (VF-14) to a 10-item instrument (VF-10). This shortened version maintained key psychometric properties for measuring vision outcomes after cataract surgery.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

[Impact of complicated myocardial injury on the clinical outcome of severe or critically ill COVID-19 patients].

Zhonghua xin xue guan bing za zhi·2020
Same author

Generating Rasch-based activity of daily living measures from the Spinal Cord Injury Longitudinal Aging Study.

Spinal cord·2017
Same author

Rasch measurement properties of the Pain Medication Questionnaire in persons with spinal cord injury.

Spinal cord·2017
Same author

New measures to capture end of life concerns in Huntington disease: Meaning and Purpose and Concern with Death and Dying from HDQLIFE (a patient-reported outcomes measurement system).

Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation·2016
Same author

Spanish translation and linguistic validation of the quality of life in neurological disorders (Neuro-QoL) measurement system.

Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation·2014
Same author

Psychiatric DisorderEffects on Rehabilitation and Ability to Return to Work.

Work (Reading, Mass.)·2014

Area of Science:

  • Health Outcomes Research
  • Psychometrics
  • Ophthalmology

Background:

  • Efficiency in health care outcome measurement is crucial.
  • Developing shortened instruments with strong psychometric properties is often overlooked.
  • Existing instruments may have limitations such as rating scale issues, ceiling effects, and item redundancy.

Purpose of the Study:

  • To demonstrate the utility of Rasch analysis in reducing instrument items while preserving psychometric integrity.
  • To refine the Visual Function-14 (VF-14) instrument for measuring vision-dependent activities related to cataract surgery.

Main Methods:

  • Rasch analysis (BIGSTEPS) was applied to the original 14-item Visual Function (VF-14) instrument.
  • The rating scale was converted to a three-point scale, and 10 additional items were added, creating a 24-item instrument (VF-24).

Related Experiment Videos

  • Item reduction was performed based on Rasch analysis criteria (mean square, calibration levels) to create a 10-item instrument (VF-10).

    • Main Results:

    • Initial Rasch analysis of the VF-14 revealed limitations including rating scale misuse, ceiling effects, and item redundancy.
    • Modifications to the VF-24 improved person separation (2.55 to 2.99) and Cronbach's alpha (.83 to .91) but increased item redundancy.
    • The final VF-10 demonstrated reduced item redundancy while maintaining comparable person separation (2.20) and Cronbach's alpha (.89) to the original VF-14.

    Conclusions:

    • Rasch analysis is effective for evaluating and refining health outcome instruments.
    • The developed VF-10 is a more efficient and psychometrically sound instrument for assessing vision function after cataract surgery.
    • This study highlights Rasch analysis as a valuable tool for creating shortened, valid, and reliable measurement instruments.