Table 1 Rules for tremor severity scoring by Archimedean spiral drawing task in the CRST.

Asked the patient to join both points of the Archimedean spiral without crossing the lines and without resting your hand or arm on the table. Test each hand

0

Normal

1

Slightly tremulous, may across lines occasionally

2

Moderately tremulous or crosses lines frequently

3

Accomplishes the task very hard, or any errors

4

Cannot complete the task