Psychometric validation of the revised SCOPA-Diary Card: expanding the measurement of non-motor symptoms in parkinson's disease
<p>Abstract</p> <p>Background</p> <p>To identify key non-motor symptoms of Parkinson's disease (PD) to include in a daily diary assessment for off-time, revise the Scales for Outcomes of Parkinson's disease Diary Card (SCOPA-DC) to include these non-motor symp...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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BMC
2011-08-01
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| Series: | Health and Quality of Life Outcomes |
| Subjects: | |
| Online Access: | http://www.hqlo.com/content/9/1/69 |
| _version_ | 1818520503342596096 |
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| author | White Michelle K Buck Philip O Rendas-Baum Regina Castelli-Haley Jane |
| author_facet | White Michelle K Buck Philip O Rendas-Baum Regina Castelli-Haley Jane |
| author_sort | White Michelle K |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>To identify key non-motor symptoms of Parkinson's disease (PD) to include in a daily diary assessment for off-time, revise the Scales for Outcomes of Parkinson's disease Diary Card (SCOPA-DC) to include these non-motor symptoms, and investigate the validity, reliability and predictive utility of the Revised SCOPA-DC in a U.S. population.</p> <p>Methods</p> <p>A convenience sample was used to recruit four focus groups of PD patients. Based on findings from focus groups, the SCOPA-DC was revised and administered to a sample of 101 PD patients. Confirmatory factor analysis was conducted to test the domain structure of the Revised SCOPA-DC. The reliability, convergent and discriminant validity, and ability to predict off-time of the Revised SCOPA-DC were then assessed.</p> <p>Results</p> <p>Based on input from PD patients, the Revised SCOPA-DC included several format changes and the addition of non-motor symptoms. The Revised SCOPA-DC was best represented by a three-factor structure: Mobility, Physical Functioning and Psychological Functioning. Correlations between the Revised SCOPA-DC and other Health-Related Quality of Life scores were supportive of convergent validity. Known-groups validity analyses indicated that scores on the Revised SCOPA-DC were lower among patients who reported experiencing off-time when compared to those without off-time. The three subscales had satisfactory predictive utility, correctly predicting off-time slightly over two-thirds of the time.</p> <p>Conclusions</p> <p>These findings provide evidence of content validity of the Revised SCOPA-DC and suggest that a three-factor structure is an appropriate model that provides reliable and valid scores to assess symptom severity among PD patients with symptom fluctuations in the U.S.</p> |
| first_indexed | 2024-12-11T01:38:24Z |
| format | Article |
| id | doaj.art-f9fdb3f0e065461088ff2bdb141df0ef |
| institution | Directory Open Access Journal |
| issn | 1477-7525 |
| language | English |
| last_indexed | 2024-12-11T01:38:24Z |
| publishDate | 2011-08-01 |
| publisher | BMC |
| record_format | Article |
| series | Health and Quality of Life Outcomes |
| spelling | doaj.art-f9fdb3f0e065461088ff2bdb141df0ef2022-12-22T01:25:07ZengBMCHealth and Quality of Life Outcomes1477-75252011-08-01916910.1186/1477-7525-9-69Psychometric validation of the revised SCOPA-Diary Card: expanding the measurement of non-motor symptoms in parkinson's diseaseWhite Michelle KBuck Philip ORendas-Baum ReginaCastelli-Haley Jane<p>Abstract</p> <p>Background</p> <p>To identify key non-motor symptoms of Parkinson's disease (PD) to include in a daily diary assessment for off-time, revise the Scales for Outcomes of Parkinson's disease Diary Card (SCOPA-DC) to include these non-motor symptoms, and investigate the validity, reliability and predictive utility of the Revised SCOPA-DC in a U.S. population.</p> <p>Methods</p> <p>A convenience sample was used to recruit four focus groups of PD patients. Based on findings from focus groups, the SCOPA-DC was revised and administered to a sample of 101 PD patients. Confirmatory factor analysis was conducted to test the domain structure of the Revised SCOPA-DC. The reliability, convergent and discriminant validity, and ability to predict off-time of the Revised SCOPA-DC were then assessed.</p> <p>Results</p> <p>Based on input from PD patients, the Revised SCOPA-DC included several format changes and the addition of non-motor symptoms. The Revised SCOPA-DC was best represented by a three-factor structure: Mobility, Physical Functioning and Psychological Functioning. Correlations between the Revised SCOPA-DC and other Health-Related Quality of Life scores were supportive of convergent validity. Known-groups validity analyses indicated that scores on the Revised SCOPA-DC were lower among patients who reported experiencing off-time when compared to those without off-time. The three subscales had satisfactory predictive utility, correctly predicting off-time slightly over two-thirds of the time.</p> <p>Conclusions</p> <p>These findings provide evidence of content validity of the Revised SCOPA-DC and suggest that a three-factor structure is an appropriate model that provides reliable and valid scores to assess symptom severity among PD patients with symptom fluctuations in the U.S.</p>http://www.hqlo.com/content/9/1/69Parkinson's diseasequality of lifeSCOPAdiaryreliabilityvaliditynon-motor symptoms |
| spellingShingle | White Michelle K Buck Philip O Rendas-Baum Regina Castelli-Haley Jane Psychometric validation of the revised SCOPA-Diary Card: expanding the measurement of non-motor symptoms in parkinson's disease Health and Quality of Life Outcomes Parkinson's disease quality of life SCOPA diary reliability validity non-motor symptoms |
| title | Psychometric validation of the revised SCOPA-Diary Card: expanding the measurement of non-motor symptoms in parkinson's disease |
| title_full | Psychometric validation of the revised SCOPA-Diary Card: expanding the measurement of non-motor symptoms in parkinson's disease |
| title_fullStr | Psychometric validation of the revised SCOPA-Diary Card: expanding the measurement of non-motor symptoms in parkinson's disease |
| title_full_unstemmed | Psychometric validation of the revised SCOPA-Diary Card: expanding the measurement of non-motor symptoms in parkinson's disease |
| title_short | Psychometric validation of the revised SCOPA-Diary Card: expanding the measurement of non-motor symptoms in parkinson's disease |
| title_sort | psychometric validation of the revised scopa diary card expanding the measurement of non motor symptoms in parkinson s disease |
| topic | Parkinson's disease quality of life SCOPA diary reliability validity non-motor symptoms |
| url | http://www.hqlo.com/content/9/1/69 |
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