The SCOPA-Motor Scale for assessment of Parkinson's disease is a consistent and valid measure

J Clin Epidemiol. 2005 Jul;58(7):674-9. doi: 10.1016/j.jclinepi.2004.09.014. Epub 2005 Apr 20.


Objective: The SCOPA-Motor Scale (S-MS) for assessment of Parkinson's disease (PD), contains 21 items in three domains: Motor examination, Disability, and Complications. Our objective was to validate the S-MS Spanish version.

Study design and setting: This validation study was based on a multicenter, cross-sectional, one-point-in-time evaluation design. The applied measures were: Unified Parkinson's Disease Rating Scale-3.0 (UPDRS); S-MS; PD Global Evaluation (PDGE); and Clinical Global Impression of severity (CGI). Completeness of data collection, floor and ceiling effect, internal consistency, precision, and construct and discriminative validity were analyzed in 151 PD patients.

Results: Scores from S-MS were fully computable. Floor effect was high for Complications (43.7%). Cronbach's alpha was > 0.90 for every domain, and item-total correlation was > 0.70 except for Examination. Standard error of measurement (SEM) ranged from 0.40 to 2.4. Convergent validity with corresponding UPDRS sections yielded coefficients > 0.90. Discriminative validity across Hoehn and Yahr (HY) and CGI stages was significant (Kruskal-Wallis, P < .0001). Insofar as internal consistency was concerned, alpha-values of the Examination sections were marginally higher for the UPDRS than for the S-MS (a finding perhaps accounted for by redundancy in this part of the UPDRS).

Conclusion: The S-MS is a consistent and valid scale, shorter by almost half than the UPDRS.

Publication types

  • Multicenter Study
  • Research Support, Non-U.S. Gov't
  • Validation Study

MeSH terms

  • Aged
  • Cross-Sectional Studies
  • Disability Evaluation
  • Female
  • Humans
  • Male
  • Motor Activity / physiology*
  • Parkinson Disease / complications
  • Parkinson Disease / physiopathology*
  • Reproducibility of Results
  • Severity of Illness Index