Table 2.

Yale Global Tic Severity Scale Subscale Scores by Study Condition

	Baseline		Nonmedication		Medication
	Mean ± SD	Range	Mean ± SD	Range	Mean ± SD	Range
Motor tic	13.2 ± 3.5	8–18	13.6 ± 2.9	9–19	12.1 ± 2.0	10–15
Vocal tic	10.6 ± 5.0	0–17	8.6 ± 4.8	0–15	4.9 ± 6.9	0–16
Total tic	23.8 ± 7.5	10–35	22.1 ± 7.6	9–34	17.0 ± 8.4	10–31
Impairment score	18.0 ± 8.9	10–40	22.8 ± 7.6	20–40	19.4 ± 9.4	10–40
Global severity	41.8 ± 13.4	20–64	45 ± 10.6	29–62	36.4 ± 15.2	20–63

Abbreviations: SD = standard deviation.