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Reliability and Validity of the Korean Short-form Eight-item Parkinson’s Disease Questionnaire (PDQ-8)

김현숙|박민정|박혜자|김세현
한국보건정보통계학회 (The Korean Society of Health informatics statistics)|2020.05|보건정보통계학회지 (Journal of Health Informatics and Statistics)|제45권 제2호|pp. 147-156|DOI https://doi.org/10.21032/jhis.2020.45.2.147

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키워드

ReliabilityValidityParkinson’s diseaseQuality of life

초록

Objectives: This study aimed to determine the reliability and validity of the Korean Parkinson’s disease questionnaire (PDQ-8) using a standard short￾form validation approach. Methods: This cross-sectional psychometric study evaluated 80 outpatients with PD who completed the Korean 39-item Par￾kinson’s disease questionnaire (PDQ-39) and PDQ-8 tools in random order. The summary index (SI) was calculated for the PDQ-39 (PDQ-39SI) and PDQ-8 (PDQ-8SI). A neurologist performed evaluations using the Hoehn and Yahr (HY) scale, unified Parkinson’s disease rating scale (UPRDS motor), mini-men￾tal state examination (MMSE), Montreal cognitive assessment (MoCA), the clinical dementia rating (CDR), and global deterioration scale (GDS). Results: The PDQ-8SI exhibited appropriate floor effect (2.5%) and ceiling effect (1.3%), with acceptable internal consistency reliability (Cronbach’s α= 0.88), item-total correlations (0.48-0.77), and inter-rater reliability (Kappa coefficient = 0.53). The PDQ-8 loaded one factor (Eigen value = 4.35, 54.51% of the variance) and had broadly similar factor loadings (0.585-0.847). The PDQ-8 had mostly goodness of fit (GFI = 0.932, NFI = 0.914, TLI = 0.973, IFI = 0.981, CFI = 0.981, and RMSEA = 0.056). The PDQ-8SI and PDQ-8 items exhibited good correlations with each other (all p< 0.05) and the PDQ-39SI (r = 0.91, p< 0.001). The PDQ-8SI was correlated with levodopa dose (r = 0.28, p= 0.028), HY score (r = 0.44, p= 0.001), UPRDS motor (r = 0.45, p= 0.007), MMES (r = -0.28, p= 0.047), MoCA (r = -0.49, p= 0.006), GDS (r = 0.33, p= 0.025), and CDR (r = 0.40, p= 0.007), respectively. Conclusions: The PDQ-8 appears to be reliable and valid. It may be useful for quickly and easily evaluating the patient’s perspectives regarding the disease’s impacts, which may guide nurs￾ing practice and future research.

Abstract

Objectives: This study aimed to determine the reliability and validity of the Korean Parkinson’s disease questionnaire (PDQ-8) using a standard short￾form validation approach. Methods: This cross-sectional psychometric study evaluated 80 outpatients with PD who completed the Korean 39-item Par￾kinson’s disease questionnaire (PDQ-39) and PDQ-8 tools in random order. The summary index (SI) was calculated for the PDQ-39 (PDQ-39SI) and PDQ-8 (PDQ-8SI). A neurologist performed evaluations using the Hoehn and Yahr (HY) scale, unified Parkinson’s disease rating scale (UPRDS motor), mini-men￾tal state examination (MMSE), Montreal cognitive assessment (MoCA), the clinical dementia rating (CDR), and global deterioration scale (GDS). Results: The PDQ-8SI exhibited appropriate floor effect (2.5%) and ceiling effect (1.3%), with acceptable internal consistency reliability (Cronbach’s α= 0.88), item-total correlations (0.48-0.77), and inter-rater reliability (Kappa coefficient = 0.53). The PDQ-8 loaded one factor (Eigen value = 4.35, 54.51% of the variance) and had broadly similar factor loadings (0.585-0.847). The PDQ-8 had mostly goodness of fit (GFI = 0.932, NFI = 0.914, TLI = 0.973, IFI = 0.981, CFI = 0.981, and RMSEA = 0.056). The PDQ-8SI and PDQ-8 items exhibited good correlations with each other (all p< 0.05) and the PDQ-39SI (r = 0.91, p< 0.001). The PDQ-8SI was correlated with levodopa dose (r = 0.28, p= 0.028), HY score (r = 0.44, p= 0.001), UPRDS motor (r = 0.45, p= 0.007), MMES (r = -0.28, p= 0.047), MoCA (r = -0.49, p= 0.006), GDS (r = 0.33, p= 0.025), and CDR (r = 0.40, p= 0.007), respectively. Conclusions: The PDQ-8 appears to be reliable and valid. It may be useful for quickly and easily evaluating the patient’s perspectives regarding the disease’s impacts, which may guide nurs￾ing practice and future research.

참고문헌 (24)

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