International study on the psychometric attributes of the Non-Motor Symptoms Scale in Parkinson disease

Martinez-Martin, Pablo, Rodriguez-Blasquez, C., Abe, Kapil, Bhattacharyya, K.B., Bloem, B.R., Carod-Artal, F.J., Prakash, R., Esselink, R.A.J., Falup-Pecurariu, C., Gallardo, M., Mir, P., Naidu, Yogini, Nicoletti, A., Sethi, Kapil, Tsuboi, Y., van Hilten, J.J., Visser, M., Zappia, M. and Chaudhuri, Kallol Ray (2009) International study on the psychometric attributes of the Non-Motor Symptoms Scale in Parkinson disease. Neurology, 73 (19). pp. 1584-1591. ISSN 0028-3878

Full text not available from this repository.


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 α 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 (rS = 0.57–0.70). Association was close between NMSS domains and the corresponding SCOPA–Autonomic domains (rS = 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.

Item Type: Article
Identifier: 10.1212/WNL.0b013e3181c0d416
Subjects: Medicine and health > Clinical medicine
Depositing User: Rod Pow
Date Deposited: 13 Jun 2014 09:27
Last Modified: 06 Feb 2024 15:42

Actions (login required)

View Item View Item