Table 1.

Demographic data for the 279 adults participants based on study site.

	University of Chicago (n = 93)	University of California, Los Angeles (n = 87)	Massachusetts General Hospital/Harvard Medical School (n = 84)	Stellenbosch University (n = 15)
Females, n (%)	77 [83.7%]	67 [77.9%]	65 [77.4%]	14 [93.3%]
Mean Age (SD)	30.1 (8.5)	29.8 (10.4)	30.5 (11.4)	34.9 (15.8)
Trichotillomania, n (%)	37 [40.0%]	33 [37.9%]	17 [20.4%]	13 [86.7%]
Skin Picking Disorder, n (%)	32 [34.4%]	17 [19.5%]	32 [38.1%]	0 [0%]
Comorbid trichotillomania plus skin picking disorder, n (%)	10 [10.8%]	16 [18.4%]	12 [14.3%]	2 [13.3%]
Controls, n (%)	14 [15.1%]	21 [24.1%]	23 [27.4%]	0 [0%]