. 2013 Jun 3;28(1):7–12.

Table III .

Difference in tic severity before and after habit reversal therapy and control treatment in the randomized controlled trials.

Study	Treatment group	YGTSS
Study	Treatment group	Pre-treatment	Post-treatment	% change
Wilhelm et al. 2003	Habit reversal	30.5	19.8	−35.1
Wilhelm et al. 2003	Supportive psychotherapy	26.6	26.9	1.1
Verdellen et al. 2004	Habit reversal	24.1	19.7	−18.3
Verdellen et al. 2004	Exposure with response prevention	26.2	17.6	−32.8
Deckersbach et al. 2006	Habit reversal	29.3	18.3	−37.5
Deckersbach et al. 2006	Supportive psychotherapy	27.7	26.8	−3.2
Piacentini et al. 2010	Habit reversal	24.7	17.1	−30.8
Piacentini et al. 2010	Supportive psychotherapy	24.6	21.1	−14.2
Wilhelm et al. 2012	Habit reversal	24.0	17.8	−25.8
Wilhelm et al. 2012	Supportive psychotherapy	21.8	19.3	−11.5

Abbreviations: YGTSS=Yale Global Tic Severity Scale.