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The Validity and Reliability of a Screening Questionnaire for Parkinson's Disease in a Community

  • Kim, Jong-Hun (Department of Social and Preventive Medicine, Sungkyunkwan University School of Medicine) ;
  • Cheong, Hae-Kwan (Department of Social and Preventive Medicine, Sungkyunkwan University School of Medicine) ;
  • Lee, Chong-Sik (Department of Neurology, University of Ulsan, College of Medicine, Asan Medical Center) ;
  • Yi, Sung-Eun (Department of Nursing, Kwandong University College of Medicine) ;
  • Park, Kun-Woo (Department of Neurology, Korea University College of Medicine)
  • Published : 2010.01.31

Abstract

Objectives: Parkinson's disease is one of the most common neurodegenerative diseases in the elderly population. In order to estimate the prevalence of Parkinson's disease in the community, the application of a good screening tool is essential. We evaluated the validity and reliability of a Parkinson's disease screening questionnaire and propose an alternative measure to improve its validity for use in community surveys. Methods: We designed the study in a three-phase approach consisting of a screening questionnaire, neurologic examination, and confirmatory examination. A repeated survey was administered to patients with disease detected in the community and on 150 subjects. We examined internal consistency using Cronbach's alpha test, test-retest reliability using the kappa statistic, and validity using sensitivity, specificity, and ROC curves. Unadjusted odds ratios were utilized for the estimation of weights for each questionnaire item. Results: The Cronbach's alpha of the questionnaire was 0.708. The kappa statistic for test-retest reliability was good to generally fair in most of the items. When newly proposed weighting scores were used, the optimum cut-off value was 7/8. When cut-off value was 5/6 for surveying prevalence in a community, the sensitivity was 0.98, and the specificity was 0.61, with simultaneous improvement in reliability. Conclusions: We recommend 5/6 as the ideal cut-off value for the survey of PD prevalence in community. This questionnaire designed for the Korean community could help future epidemiologic studies of PD.

Keywords

References

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