title: Activities of daily living questionnaire from patients' perspectives in Parkinson's disease: a cross-sectional study.
abstract: BACKGROUND
  The aim of this study was to develop an assessment tool for activities of daily living (ADL) from the perspective of patients with Parkinson's disease (PD) and examine the validity and reliability of the assessment.
  
  
  METHODS
  A preliminary 45-item questionnaire was developed through intensive interviews with 54 patients with PD and administered to another group of 248 patients with PD. Based on clinical and statistical analyses, 20 ADL-items were selected. The final 20-item questionnaire was examined in the other group of 59 patients with PD.
  
  
  RESULTS
  The new ADL questionnaire showed high internal consistency (Cronbach's α, 0.962-0.966) and acceptable test-retest reliability (0.632-0.984). Concurrent validity was shown as a significant positive correlation between the new ADL questionnaire and other ADL or clinical instruments. The Hoehn and Yahr stage showed the highest degree of correlation with the new ADL questionnaire, followed by the other ADL scales (Schwab and England ADL and the ADL subscore of the Unified Parkinson's Disease Rating Scale). Additionally, a regression analysis was conducted with the disease-specific quality of life questionnaire, and the new ADL questionnaire was the most powerful predictor of quality of life among the clinical instruments.
  
  
  CONCLUSIONS
  The new ADL questionnaire is a valid tool for assessing ADL from the perspectives of patients with PD.
authors.affiliation: Department of Neurology, Dong-A University School of Medicine, 3-1, Dongdaesin-dong, Seo-gu, Busan, Korea, 607-020.
authors.forename: Su-Yun
authors.initials: SY
authors.lastname: Lee
authors.affiliation: Department of Neurology, Dong-A University School of Medicine, 3-1, Dongdaesin-dong, Seo-gu, Busan, Korea, 607-020.
authors.forename: Sung Kwan
authors.initials: SK
authors.lastname: Kim
authors.affiliation: Department of Neurology, Dong-A University School of Medicine, 3-1, Dongdaesin-dong, Seo-gu, Busan, Korea, 607-020. smcheon@dau.ac.kr.
authors.forename: Sang-Myung
authors.initials: SM
authors.lastname: Cheon
authors.affiliation: Department of Prevention and Management of Regional Cardiocerebrovascular Center, Dong-A University Medical Centre, Busan, Korea.
authors.forename: Jung-Wook
authors.initials: JW
authors.lastname: Seo
authors.affiliation: Department of Physical Medicine and Rehabilitation, Changwon Hanseo Rehabilitation Hospital, Changwon, Korea.
authors.forename: Min Ah
authors.initials: MA
authors.lastname: Kim
authors.affiliation: Department of Neurology, Dong-A University School of Medicine, 3-1, Dongdaesin-dong, Seo-gu, Busan, Korea, 607-020.
authors.forename: Jae Woo
authors.initials: JW
authors.lastname: Kim
mesh_terms: D000203:Activities of Daily Living / Q000523:psychology*; D000368:Aged; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D010300:Parkinson Disease / Q000523:psychology*; D011237:Predictive Value of Tests; D011594:Psychometrics; D011788:Quality of Life; D011795:Surveys and Questionnaires
keywords: Activities of daily living; Parkinson’s disease; Questionnaire