According to the analysis by HapMap Project, the rs671 allele of the ALDH2 gene responsible for the flush reaction is rare among Europeans and Africans, and it is very rare among Mexican-Americans.
根据人类基因组图谱项目分析，导致脸红的rs671等位基因上的ALDH2基因，在欧洲人和非洲人中非常罕见，在墨西哥裔美国人中更稀少。