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Essential tremor (ET), green diamonds; borderline ET, blue squares, and normals, red circles. A total tremor score ≥10 (horizontal line) separated the borderline ET cases from normals with a sensitivity of 77.8% and a specificity of 94.7% (correct classification, 84.7%). One borderline ET did not have a total tremor score and two others had identical total tremor scores and ages.
