Reliability of a new scale for essential tremor

Southern Illinois University School of Medicine, Springfield. Illinois, USA. .
Movement Disorders (Impact Factor: 5.68). 10/2012; 27(12):1567-9. DOI: 10.1002/mds.25162
Source: PubMed


The objective of this study was to determine the reliability of a new scale for the clinical assessment of essential tremor. The Essential Tremor Rating Assessment Scale contains 9 performance items that rate action tremor in the head, face, voice, limbs, and trunk from 0 to 4 in half-point intervals. Head and limb tremor ratings are defined by specific amplitude ranges in centimeters.
Videos of 44 patients and 6 controls were rated by 10 specialists on 2 occasions 1-2 months apart. Inter- and intrarater reliability was assessed with a 2-way random-effects intraclass correlation, using an absolute agreement definition.
Inter- and intrarater intraclass correlations for head and upper-limb tremor ranged from 0.86 to 0.96, and intraclass correlations for total score were 0.94 and 0.96. The intraclass correlations for voice, face, trunk, and leg were less robust.
This scale is an exceptionally reliable tool for the clinical assessment of essential tremor. © 2012 Movement Disorder Society.

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    • "No population norms, other than expectation of " normal " rating on all items; Not systematically used in any other neurological or other medical condition. Sum of items interpretable as lesser or greater evidence of tremor intruding on a variety of tasks TETRAS – ADL subscale (Elble et al., 2012) Reduction in ADL abilities, mostly self-care, that are typically compromised in ET Experienced clinician, as above 8–12 of 12 items, depending on how some items are interpreted; some tasks would typically be done with dominant hand, but scoring for some items includes the possibility of using both hands for stability; others would naturally be two-handed tasks Ordinal scale ratings Designed only for tremor. No population norms, other than expectation of " normal " rating on all items; Not systematically used in any other neurological or other medical condition. "
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