APOE and hypertensive disorder: In this case-control study of 3000 cases of ICH among Black, Hispanic, and White patients, the ɛ2 and ɛ4 alleles of APOE, the gene encoding apolipoprotein E, were associated with lobar ICH in White but not Black and Hispanic patients; hypertension was a risk factor for both lobar and nonlobar ICH in all groups; and the mean age for ICH among Black and Hispanic patients was more than 10 years younger than that of their White counterparts.