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KMID : 0371020100430010009
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Journal of Preventive Medicine and Public Health
2010 Volume.43 No. 1 p.9 ~ p.17
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The Validity and Reliability of a Screening Questionnaire for Parkinson’s Disease in a Community
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Kim Jong-Hun
Cheong Hae-Kwan
Lee Chong-Sik
Yi Sung-Eun
Park Kun-Woo
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Abstract
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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.
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KEYWORD
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Screening, Questionnaire, Validity, Reliability, Parkinson’s disease, Community
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