Rasch analysis of the short form 8-item Parkinson's Disease Questionnaire (PDQ-8).
Purpose: To evaluate the Italian version of the 8-item Parkinson's Disease Questionnaire (PDQ-8)--a subset of PDQ-39 (a 39-item health-related quality of life instrument for subjects with Parkinson's Disease [PD])--through classical psychometric techniques and Rasch analysis.Methods: Two convenience...
| Publicado en: | Quality of Life Research Vol. 17; no. 4; pp. 541 - 549 |
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| Autores principales: | , , , , , |
| Formato: | research Journal Article |
| Publicado: |
Springer Nature
May2008
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=105685311&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 105685311 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 09629343 GPQ jtl: Quality of Life Research issn: 09629343 maglogo: N pubinfo: dt: May2008 vid: 17 iid: 4 pid: 237 pub: Springer Nature place: New York, New York artinfo: ui: 105685311 105685311 NLM18415705 2010079962 10.1007/s11136-008-9341-6 NLM18415705 105685311 ppf: 541 ppct: 8 formats: fmt: @attributes: type: P tig: atl: Rasch analysis of the short form 8-item Parkinson's Disease Questionnaire (PDQ-8). aug: au: Franchignoni F Giordano A Ferriero G Franchignoni, Franco Giordano, Andrea Ferriero, Giorgio affil: Unit of Occupational Rehabilitation and Ergonomics, Fondazione Salvatore Maugeri, Clinica del Lavoro e della Riabilitazione, IRCCS, Veruno, NO, Italy sug: subj: Parkinson Disease Psychosocial Factors Quality of Life Psychosocial Factors Aged Female Italy Male Parkinson Disease Diagnosis Parkinson Disease Physiopathology Psychological Tests Psychometrics Questionnaires Surveys Human Aged: 65+ years Female Male ab: Purpose: To evaluate the Italian version of the 8-item Parkinson's Disease Questionnaire (PDQ-8)--a subset of PDQ-39 (a 39-item health-related quality of life instrument for subjects with Parkinson's Disease [PD])--through classical psychometric techniques and Rasch analysis.Methods: Two convenience samples (100 PD subjects each) were observed consecutively from 2004 to 2006. One group completed the PDQ-8 nested within PDQ-39, the other, the stand-alone PDQ-8.Results: Once verified that the two independent samples came from the same population and showed consistent item calibrations using differential item functioning analysis, the two groups were combined. Cronbach's alpha was 0.72. According to Rasch analysis, the response scale of PDQ-8 could be simplified into a 3-category rating scale. After that, all the PDQ-8 items fitted the construct that the scale was intended to measure. Item separation reliability of PDQ-8 was 0.98 and person separation reliability was 0.70. Principal component analysis on the standardized residuals suggested a minor departure in the data from Rasch criteria (multidimensionality) and some marginal inter-item dependency.Conclusions: The PDQ-8 embedded in the PDQ-39 presented psychometric properties similar to the stand-alone PDQ-8. Our results, while consistent with previous classical psychometric analyses, add information on the meaningfulness of PDQ-8 in people with PD. In particular, a simplification of its rating scale is recommended. Moreover, additional analyses should be performed in order to further check unidimensionality and local dependence, and try to improve item selection and scaling properties of the questionnaire. In order to use the PDQ-8 for clinical decision-making in reference to individuals, its reliability should first be increased. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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