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WOrk-Related Questionnaire for UPper extremity disorders (WORQ-UP): Factor Analysis and Internal Consistency

  • Bas R. Aerts
    Correspondence
    Corresponding author Bas R. Aerts, MD, Coronel Institute of Occupational Health, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands.
    Affiliations
    Academic Medical Center, University of Amsterdam, Coronel Institute of Occupational Health, Amsterdam Public Health Research Institute, Amsterdam, The Netherlands

    Amphia Hospital, Department of Orthopaedic Surgery, Upper Limb Unit, Breda, The Netherlands
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  • P. Paul Kuijer
    Affiliations
    Academic Medical Center, University of Amsterdam, Coronel Institute of Occupational Health, Amsterdam Public Health Research Institute, Amsterdam, The Netherlands
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  • Annechien Beumer
    Affiliations
    Amphia Hospital, Department of Orthopaedic Surgery, Upper Limb Unit, Breda, The Netherlands
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  • Denise Eygendaal
    Affiliations
    Amphia Hospital, Department of Orthopaedic Surgery, Upper Limb Unit, Breda, The Netherlands

    Academic Medical Center, University of Amsterdam, Department of Orthopaedic Surgery, Amsterdam, The Netherlands
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  • Monique H. Frings-Dresen
    Affiliations
    Academic Medical Center, University of Amsterdam, Coronel Institute of Occupational Health, Amsterdam Public Health Research Institute, Amsterdam, The Netherlands
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Published:April 17, 2018DOI:https://doi.org/10.1016/j.apmr.2018.03.013

      Abstract

      Objective

      To test a 17-item questionnaire, the WOrk-Related Questionnaire for UPper extremity disorders (WORQ-UP), for dimensionality of the items (factor analysis) and internal consistency.

      Design

      Cross-sectional study.

      Setting

      Outpatient clinic.

      Participants

      A consecutive sample of patients (N=150) consisting of all new referral patients (either from a general physician or other hospital) who visited the orthopedic outpatient clinic because of an upper extremity musculoskeletal disorder.

      Interventions

      Not applicable.

      Main Outcome Measures

      Number and dimensionality of the factors in the WORQ-UP.Results: Four factors with eigenvalues (EVs) >1.0 were found. The factors were named exertion, dexterity, tools & equipment, and mobility. The EVs of the factors were, respectively, 5.78, 2.38, 1.81, and 1.24. The factors together explained 65.9% of the variance. The Cronbach alpha values for these factors were, respectively, .88, .74, .87, and .66.

      Conclusions

      The 17 items of the WORQ-UP resemble 4 factors—exertion, dexterity, tools & equipment, and mobility—with a good internal consistency.

      Keywords

      List of abbreviations:

      CA (Cronbach alpha), EFA (exploratory factor analysis), EV (eigenvalue), FA (factor analysis), KMO (Kaiser-Meyer-Olkin), PROM (patient-reported outcome measure), WORQ-UP (WOrk-Related Questionnaire for UPper extremity disorders)
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