Reliability of a new scale for essential tremor

Rodger Elble, Cynthia Comella, Stanley Fahn, Mark Hallett, Joseph Jankovic, Jorge L. Juncos, Peter Lewitt, Kelly Lyons, William Ondo, Rajesh Pahwa, Kapil Sethi, Natividad Stover, Daniel Tarsy, Claudia Testa, Ron Tintner, Ray Watts, Theresa Zesiewicz

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

Background: 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. Methods: 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. Results: 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. Conclusions: This scale is an exceptionally reliable tool for the clinical assessment of essential tremor.

Original languageEnglish (US)
Pages (from-to)1567-1569
Number of pages3
JournalMovement Disorders
Volume27
Issue number12
DOIs
StatePublished - Oct 2012

Keywords

  • Essential tremor
  • Rating scale
  • Reliability

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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