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International study on the psychometric attributes of the Non-Motor Symptoms Scale in Parkinson disease
Open accessAbstract
BACKGROUND: Nonmotor symptoms (NMS) have a great impact on patients with Parkinson disease (PD). The Non-Motor Symptoms Scale (NMSS) is an instrument specifically designed for the comprehensive assessment of NMS in patients with PD. NMSS psychometric properties have been tested in this study. METHODS: Data were collected in 12 centers across 10 countries in America, Asia, and Europe. In addition to the NMSS, the following measures were applied: Scales for Outcomes in Parkinson's Disease (SCOPA)-Motor, SCOPA-Psychiatric Complications (SCOPA-PC), SCOPA-Cognition, Hoehn and Yahr Staging (HY), Clinical Impression of Severity Index for Parkinson's Disease (CISI-PD), SCOPA-Autonomic, Parkinson's Disease Sleep Scale (PDSS), Parkinson's Disease Questionnaire-39 items (PDQ-39), and EuroQol-5 dimensions (EQ-5D). NMSS acceptability, reliability, validity, and precision were analyzed. RESULTS: Four hundred eleven patients with PD, 61.3% men, were recruited. The mean age was 64.5 +/- 9.9 years, and mean disease duration was 8.1 +/- 5.7 years. The NMSS score was 57.1 +/- 44.0 points. The scale was free of floor or ceiling effects. For domains, the Cronbach alpha coefficient ranged from 0.44 to 0.85. The intraclass correlation coefficient (0.90 for the total score, 0.67-0.91 for domains) and Lin concordance coefficient (0.88) suggested satisfactory reproducibility. The NMSS total score correlated significantly with SCOPA-Autonomic, PDQ-39, and EQ-5D (r(S) = 0.57-0.70). Association was close between NMSS domains and the corresponding SCOPA-Autonomic domains (r(S) = 0.51-0.65) and also with scales measuring related constructs (PDSS, SCOPA-PC) (all p < 0.0001). The NMSS total score was higher for women (p < 0.02) and for increasing disease duration, HY, and CISI-PD severity level (p < 0.001). The SEM was 13.91 for total score and 1.71 to 4.73 for domains. CONCLUSION: The Non-Motor Symptoms Scale is an acceptable, reproducible, valid, and precise assessment instrument for nonmotor symptoms in Parkinson disease.
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Cites
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Self-citationNon-recognition of depression and other non-motor symptoms in Parkinson's disease
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Cited by
The importance of non-motor disturbances to quality of life in Parkinson's disease
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Self-citationNon-motor symptoms and the quality of life in multiple system atrophy with different subtypes
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Metadata
- Authors
- Martinez-Martin, P., Rodriguez-Blazquez, C., Abe, K., Bhattacharyya, K. B., Bloem, B. R., Carod-Artal, F. J., Prakash, R., Esselink, R. A. J., Falup-Pecurariu, C., Gallardo, M., Mir, P., Naidu, Y., Nicoletti, A., Sethi, K., Tsuboi, Y., van Hilten, J. J., Visser, M., Zappia, M., & Chaudhuri, K. R.
- Venue
- Neurology
- Published
- 2009-11-10
- Volume
- 73
- Issue
- 19
- Pages
- 1584-1591
- ISSN
- 0028-3878 (ISSN-L)
- 1526-632X
- OpenAlex
- W2159231668
- Cited by
- 262
- References
- 10
- FWCI
- 7.13
- Type
- journal article
- Language
- en
- Open access
- bronze
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