Table 1: Prevalence of intracranial atherosclerotic disease/extracranial atherosclerotic disease by race.

RaceICADECAD

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.