Table 3.

Racial and ethnic composition of all probands and DNA-donating probands*

		All probands		DNA-donating probands
		No.	%	No.	%
Race
White, non-Hispanic		447	77	180	93
African American		22	4	7	3.5
Other		111	19	7	3.5
	Total	580	100	194	100
Ethnicity
Hispanic		20	3	3	2
Non-Hispanic		560	97	188	98
	Total	580	100	191	100

* Diagnosis of ischemic stroke was confirmed for at least one living sibling before DNA was donated.