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The National Health and Nutrition Examination Survey Epidemiologic Follow-up Study

Wayne H. Giles, MD, MS; Steven J. Kittner, MD, MPH; J. Richard Hebel, PhD; Katalin G. Losonczy, MA; Roger W. Sherwin, MB, BChir

Arch Intern Med. 1995;155(12):1319-1324.

Abstract
Objective
To determine whether blacks in the First National Health and Nutrition Examination Survey Epidemiologic Follow-up Study remained at increased risk for cerebral infarction after adjusting for stroke risk factors and sociodemographic factors.

Methods
A cohort study involving 8203 whites and 1362 blacks who participated in the First National Health and Nutrition Examination Survey Epidemiologic Follow-up Study. During the 13-year follow-up, 538 and 122 cerebral infarctions occurred in whites and blacks, respectively.

Results
The black-white risk for cerebral infarction varied by age (P=.007 for race-age interaction). Compared with whites of the same age, blacks aged 35 to 44 years were at significantly increased risk for cerebral infarction (relative risk, 2.62; 95% confidence interval, 1.23 to 5.57), while older blacks, those older than 64 years, were not at increased risk (relative risk, 1.14; 95% confidence interval, 0.90 to 1.46). The relative risk for cerebral infarction decreased to 2.07 (95% confidence interval, 0.97 to 4.42) in younger blacks and 0.82 (95% confidence interval, 0.29 to 2.33) in older blacks after adjustment for age, sex, education, history of heart disease, diabetes, systolic blood pressure, treatment for hypertension, Quetelet index, and serum hemoglobin and magnesium levels.

Conclusions
These results indicate that much of the increased risk for cerebral infarction experienced by blacks can be explained by their higher prevalence of stroke risk factors, especially diabetes, hypertension, and lower educational attainment. Younger blacks, however, may still be at increased risk after adjusting for stroke risk factors.

(Arch Intern Med. 1995;155:1319-1324)

Author Affiliations
From the Departments of Epidemiology and Preventive Medicine (Drs Giles, Kittner, Hebel, and Sherwin), and Neurology (Dr Kittner), and the Stroke Epidemiology Unit (Drs Kittner and Sherwin), University of Maryland School of Medicine, Baltimore; and the Epidemiology, Demography, and Biometry Program (Ms Losonczy), National Institute on Aging, Bethesda, Md.

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