Bain, PG

Deuschl, G

Elble R,

Forjaz, MJ

Haubenberger, D

Martinez Martin, P

Rodriguez-Blazquez, C

Testa, C

Movement Disorders

English

Background: This article proposes an International
Parkinson and Movement Disorder Society (MDS)-
UPDRS tremor-based scale and describes its measurement
properties, with a view to developing an
improved scale for assessing tremor in Parkinson’s disease
(PD).
Methods: This was a cross-sectional, multicenter study
of 435 PD patients. Rasch analysis was performed on
the 11 MDS-UPDRS tremor items. Construct validity,
precision, and test-retest reliability were also analyzed.
Results: After some modifications, which included
removal of an item owing to redundancy, the obtained
MDS-UPDRS tremor scale showed moderate reliability,
unidimensionality, absence of differential item functioning,
satisfactory convergent validity with medication,
and better precision than the raw sum score. However,
the scale displayed a floor effect and a need for more
items measuring lower levels of tremor.
Conclusions: The MDS-UPDRS tremor scale provides
linear scores that can be used to assess tremor in PD in a
valid, reliable way. The scale might benefit from modifications
and studies that analyze its responsivenes

Elble R

Spiral - Imperial College Digital Repository

Proposing a Parkinson's disease specific tremor scale from the MDS-UPDRS.

http://spiral.imperial.ac.uk/bitstream/10044/1/24595/2/MovDisord2015_Rasch%20Tremor.pdf

Proposing a Parkinson's disease specific tremor scale from the MDS-UPDRS.

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