两项研究已显示白种美国人中原发性震颤患病率高于具有黑人血统的美国人,第三项研究则报告具有白人血统的美国人被医生诊断为原发性震颤的可能性高于具有黑人血统的美国人。[15]Haerer AF, Anderson DW, Schoenberg BS. Prevalence of essential tremor. Results from the Copiah County study. Arch Neurol. 1982;39:750-751.http://www.ncbi.nlm.nih.gov/pubmed/7138316?tool=bestpractice.com[16]Louis ED, Fried LP, Fitzpatrick AL, et al. Regional and racial differences in the prevalence of physician-diagnosed essential tremor in the United States. Mov Disord. 2003;18:1035-1040.http://www.ncbi.nlm.nih.gov/pubmed/14502671?tool=bestpractice.com[17]Louis ED, Marder K, Cote L, et al. Differences in the prevalence of essential tremor among elderly African Americans, whites, and Hispanics in northern Manhattan, NY. Arch Neurol. 1995;52:1201-1205.http://www.ncbi.nlm.nih.gov/pubmed/7492295?tool=bestpractice.com