Apolipoprotein E and mortality in African-Americans and Yoruba.
The literature on the association between apolipoprotein E (ApoE) and mortality across ethnic and age groups has been inconsistent. No studies have looked at this association in developing countries. We used data from the Indianapolis-Ibadan Dementia study to examine this association between APOE and mortality in 354 African-Americans from Indianapolis and 968 Yoruba from Ibadan, Nigeria. Participants were followed up to 9.5 years for Indianapolis and 8.7 years for Ibadan. Subjects from both sites were divided into 2 groups based upon age at baseline. A Cox proportional hazards regression model adjusting for age at baseline, education, hypertension, smoking history and gender in addition to time-dependent covariates of cancer, diabetes, heart disease, stroke, and dementia was fit for each cohort and age group. Having ApoE epsilon4 alleles significantly increased mortality risk in Indianapolis subjects under age 75 (hazard ratio: 2.00; 95% CI: 1.19-3.35; p = 0.0089). No association was found in Indianapolis subjects 75 and older (hazard ratio: 0.71; 95% CI: 0.45-1.10; p = 0.1238), Ibadan subjects under 75 (hazard ratio: 1.04; 95% CI: 0.78 to 1.40; p = 0.7782), or Ibadan subjects over 75 (hazard ratio: 1.21; 95% CI: 0.83 to 1.75; p = 0.3274).
Lane
Kathleen A
KA
Department of Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA. kalane@iupui.edu
Gao
Sujuan
S
Hui
Siu L
SL
Murrell
Jill R
JR
Hall
Kathleen S
KS
Hendrie
Hugh C
HC
D000368:Aged; D000544:Alzheimer Disease / Q000235:genetics* / Q000401:mortality*; D053327:Apolipoprotein E4; D001057:Apolipoproteins E / Q000235:genetics*; D044383:Black People / Q000235:genetics* / Q000706:statistics & numerical data; D002318:Cardiovascular Diseases / Q000401:mortality; D002423:Cause of Death; D015331:Cohort Studies; D003431:Cross-Cultural Comparison; D003906:Developing Countries; D005260:Female; D005500:Follow-Up Studies; D005838:Genotype; D006801:Humans; D007196:Indiana; D008297:Male; D008875:Middle Aged; D009549:Nigeria; D016016:Proportional Hazards Models; D012306:Risk; D016019:Survival Analysis; D001741:Black or African American
D053327:Apolipoprotein E4; D001057:Apolipoproteins E