Table 1.

Description of patients from 3 cohorts.

	n	Age(SD)	Male Sex (%)	Mean YGTSS scores (SD)	OCD diagnosis (%)
Sample 1:
Ashkenazi	138	22.5 (15)	74%	20.9 (2.9)	61.4%
Costa Rica	222	15.7 (11.9)	81%	29.1 (3.4)	4.3%
Sample 2:
Dutch patients	183	27.9 (15.2)	70%	20.1 (10)	30%
Dutch relatives
- Parents	219	51.4 (11)	45%	2.15 (1)	3%
- Siblings	63	23.4 (14.7)	40%	6.5 (8)	7%
- Offspring	36	16.3 (6.8)	60%	5.8 (8)	14%

SD: standard deviation; YGTSS: Yale Global Tic Severity Score; OCD: Obsessive Compulsive Disorder.