Table 1.

Item mean, standard deviation, and correlation with 9-item total score

Item	Mean	SD	Correlation with total score
1. Right before I do a tic, I feel like my insides are itchy.	1.66	.93	.42*
2. Right before I do a tic, I feel pressure inside my brain or body.	2.09	1.11	.64*
3. Right before I do a tic, I feel “wound up” or tense inside.	2.53	1.03	.78*
4. Right before I do a tic, I feel like something is not “just right.”	2.48	1.07	.76*
5. Right before I do a tic, I feel like something isn’t complete.	2.20	1.08	.65*
6. Right before I do a tic, I feel like there is energy in my body that needs to get out.	2.75	1.06	.69*
7. I have these feelings almost all the time before I do a tic.	2.76	1.01	.75*
8. These feelings happen for every tic I have.	2.30	1.01	.56*
9. After I do the tic, the itchiness, energy, pressure, tense feelings, or feelings that something isn’t “just right” or complete go away, at least for a little while.	2.76	1.05	.61*
10. I am able to stop my tics, even if only for a short period of time.	2.81	1.01	N/A-not included in total

^*Significant at the .01 level.