![]() ![]() Test-retest intraclass correlations (ICCs) (two-way random single measures, absolute agreement) were excellent for the FTM ratings (ICC 0.90, 95% CI 0.76-0.96) and tablet (ICC 0.97, 95% CI 0.91-0.99). The mean peak-to-peak tremor displacement (cm) in the four spirals and mean FTM ratings were compared statistically. Tremor in each digitized drawing was computed with spectral analysis in an independent laboratory, blinded to the clinical ratings. The drawings were simultaneously digitized with a digitizing tablet. The large and small spirals of FTM were drawn with each hand on two consecutive days by 14 men and four women (age 60☘.7 years ) with mild to severe essential tremor. We performed the first blinded comparison of Fahn-Tolosa-Marín (FTM) ratings and tablet measures of essential tremor to determine if a digitizing tablet is better than 0-4 ratings in detecting changes in essential tremor that exceed random variability in tremor amplitude. Drawing Archimedes spirals is a popular and valid method of assessing action tremor in the upper limbs.
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