Table 2. Correlations (r) Between Clinic EF and PI and YGTSS Scores at Weeks 2 and 3.

	Week 2 YGTSS Week 1 clinic direct observation	Week 3 YGTSS Week 2 clinic direct observation
EF (motor) – YGTSS motor frequency subscale	.07	.40*
PI (motor) – YGTSS motor frequency subscale	.15	.31*
EF (vocal) – YGTSS vocal frequency subscale	.64*	.62*
PI (vocal) – YGTSS vocal frequency subscale	.53*	.64*
EF (motor and vocal) – YGTSS severity score	−.12	−.04
PI (motor and vocal) – YGTSS severity score	−.15	−.14

^*p < .05.

EF  =  event frequency; PI  =  partial interval; YGTSS  =  Yale Global Tic Severity Scale.