(Stroke. 2001;32:1725.)
© 2001 American Heart Association, Inc.
Original Contributions |
Race-Ethnic Disparities in the Impact of Stroke Risk Factors
The Northern Manhattan Stroke Study
From the Columbia University College of Physicians and Surgeons and School of Public Health, New York, NY; Department of Neurology (R.L.S., B.B.-A., I-F.L., M.E., W.A.H.), Sergievsky Center (R.L.S., M.E., W.A.H.), Division of Epidemiology (R.L.S., G.A., W.A.H., S.S.), Division of Socio-Medical Science (B.B.-A.), Department of Medicine (Division of General Medicine) (G.A., S.S.), and Division of Biostatistics (I-F.L., M.C.P.).
Correspondence to Ralph L. Sacco, MD, MS, Neurological Institute, 710 W 168th St, New York, NY 10032.
Background and Purpose—— Stroke risk factors have been determined in large part through epidemiological studies in white cohorts; as a result, race-ethnic disparities in stroke incidence and mortality rates remained unexplained. The aim in the present study was to compare the prevalence, OR, and etiological fraction (EF) of stroke risk factors among white, blacks, and Caribbean Hispanics living in the same urban community of northern Manhattan.
Methods—— In this population-based incident case-control study, cases (n=688) of first ischemic stroke were prospectively matched 1:2 by age, sex, and race-ethnicity with community controls (n=1156). Risk factors were determined through in-person assessment. Conditional logistic regression was used to calculate adjusted ORs in each race-ethnic group. Prevalence and multivariate EFs were determined in each race-ethnic group.
Results—— Hypertension was an independent risk factor for whites (OR 1.8, EF 25%), blacks (OR 2.0, EF 37%), and Caribbean Hispanics (OR 2.1, EF 32%), but greater prevalence led to elevated EFs among blacks and Caribbean Hispanics. Greater prevalence rates of diabetes increased stroke risk in blacks (OR 1.8, EF 14%) and Caribbean Hispanics (OR 2.1 P<0.05, EF 10%) compared with whites (OR 1.0, EF 0%), whereas atrial fibrillation had a greater prevalence and EF for whites (OR 4.4, EF 20%) compared with blacks (OR 1.7, EF 3%) and Caribbean Hispanics (OR 3.0, EF 2%). Coronary artery disease was most important for whites (OR 1.3, EF 16%), followed by Caribbean Hispanics (OR 1.5, EF 6%) and then blacks (OR 1.1, EF 2%). Prevalence of physical inactivity was greater in Caribbean Hispanics, but an elevated EF was found in all groups.
Conclusions—— The prevalence, OR, and EF for stroke risk factors vary by race-ethnicity. These differences are crucial to the etiology of stroke, as well as to the design and implementation of stroke prevention programs.
Key Words: data interpretation, statistical • epidemiology • risk factors • stroke
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