Table 1.

Prevalence of intracranial atherosclerotic disease/extracranial atherosclerotic disease by race.

Race	ICAD	ECAD
South Asians [11, 12]	20%–54%	10%
East Asians [11]	7%	18%
US Whites [3, 13]	1%–24%	11%–33%
US Blacks [3, 13]	6%–22%	8%–15%
US Hispanics [3]	11%	9%
Chinese [14]	33%–50%	19%
Koreans [1, 15]	56.3%†–26.4%	12.2%
Singapore [1]	47.9%	NR
Thailand [16]	47%	49%

^†The authors used 30% stenosis as cutoff.

ICAD: intracranial atherosclerotic disease, ECAD: extracranial atherosclerotic disease.