Research Commons
      • Browse 
        • Communities & Collections
        • Titles
        • Authors
        • By Issue Date
        • Subjects
        • Types
        • Series
      • Help 
        • About
        • Collection Policy
        • OA Mandate Guidelines
        • Guidelines FAQ
        • Contact Us
      • My Account 
        • Sign In
        • Register
      View Item 
      •   Research Commons
      • University of Waikato Research
      • Computing and Mathematical Sciences
      • Computing and Mathematical Sciences Papers
      • View Item
      •   Research Commons
      • University of Waikato Research
      • Computing and Mathematical Sciences
      • Computing and Mathematical Sciences Papers
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Patient-reported quality of life for cataract surgery: prospective validation of the ‘Impact on Life’ and Catquest-9SF questionnaires in New Zealand

      Li, Sunny S.; Misra, Stuti L.; Wallace, Henry B.; Hunt, Lynette Anne; McKelvie, James
      Thumbnail
      Files
      Patient-reported_quality_of_li.pdf
      Published version, 2.094Mb
      Find in your library  
      Citation
      Export citation
      Li, S. S., Misra, S. L., Wallace, H. B., Hunt, L. A., & McKelvie, J. (2019). Patient-reported quality of life for cataract surgery: prospective validation of the ‘Impact on Life’ and Catquest-9SF questionnaires in New Zealand. The New Zealand Medical Journal, 132(1503).
      Permanent Research Commons link: https://hdl.handle.net/10289/13449
      Abstract
      AIMS: The 'Impact on Life' (IoL) questionnaire is used to prioritise publicly funded cataract surgery in New Zealand, however, it has not been formally validated for ophthalmic use. The Catquest-9SF questionnaire is widely used to assess vision-related quality of life (VRQoL) but has not been validated in New Zealand. This study evaluates the validity of the IoL and Catquest-9SF questionnaires for measuring VRQoL in New Zealand.

      METHOD: Formal ethics approval was obtained. Participants completed the IoL and Catquest-9SF questionnaires before and three months after routine cataract surgery. Rasch analysis was used to investigate all qualitative questionnaire responses. Results were correlated with the change in patient visual acuity.

      RESULTS: There was a 100% response rate at follow-up (41 participants). Disordered probability thresholds were observed for all IoL questions but no Catquest-9SF questions. All IoL questions demonstrated unsatisfactory mean-square fit statistics. Differences in visual acuity following surgery correlated with the change in total F-score for the Catquest-9SF (P=0.04), but not IoL responses (P=0.17).

      CONCLUSIONS: Disordered probability thresholds, poor question-model fit and correlation with visual acuity changes indicate the current IoL questionnaire is poorly suited for assessment of VRQoL. In contrast, the Catquest-9SF demonstrated credible results for assessment of VRQoL in New Zealand.
      Date
      2019
      Type
      Journal Article
      Publisher
      NZMA
      Rights
      This article is published in the New Zealand Medical Journal. © NZMA. Used with permission.
      Collections
      • Computing and Mathematical Sciences Papers [1455]
      Show full item record  

      Usage

      Downloads, last 12 months
      72
       
       

      Usage Statistics

      For this itemFor all of Research Commons

      The University of Waikato - Te Whare Wānanga o WaikatoFeedback and RequestsCopyright and Legal Statement