Evidence-based assessment/Instruments/Yale Global Tic Severity Scale

The Yale Global Tic Severity Scale (YGTSS) is a psychological measure designed to assess the severity and frequency of symptoms of disorders such as tic disorder, Tourette syndrome, and obsessive-compulsive disorder, in children and adolescents between ages 6 and 17. It is completed by parents and takes approximately 15–20 minutes.

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Wikipedia has more about this subject: Yale Global Tic Severity Scale

Scoring and Interpretation

YGTSS consists of three parts over the span of 17 pages. The first section identifies symptoms of motor and phonic tics, severity, and age of onset; the second section concerns OCD symptoms, severity, and age of onset; and the last section concerns environmental effects on symptoms.

Each question on YGTSS addresses the existence and frequency of certain anxiety symptoms, the latter of which measured on a 0-5 scale from "absent" to "severe." The section related to OCD symptoms addresses the degree of impairment the symptoms have on the child instead, measured on a 0-5 scale from "no interference" to "severe interference."

The YGTSS as a whole does not have a comprehensive scoring system. More symptoms at a higher frequency generally indicate higher severity of a disorder.