TY - JOUR T1 - Racial and regional differences in venous thromboembolism in the United States in 3 cohorts. JF - Circulation Y1 - 2014 A1 - Zakai, Neil A A1 - McClure, Leslie A A1 - Judd, Suzanne E A1 - Safford, Monika M A1 - Folsom, Aaron R A1 - Lutsey, Pamela L A1 - Cushman, Mary KW - African Continental Ancestry Group KW - Aged KW - Cohort Studies KW - European Continental Ancestry Group KW - Female KW - Humans KW - Longitudinal Studies KW - Male KW - Middle Aged KW - Prevalence KW - Proportional Hazards Models KW - Prospective Studies KW - Residence Characteristics KW - Risk Factors KW - United States KW - Venous Thromboembolism AB -

BACKGROUND: Blacks are thought to have a higher risk of venous thromboembolism (VTE) than whites. However, prior studies are limited to administrative databases that lack specific information on VTE risk factors or have limited geographic scope.

METHODS AND RESULTS: We ascertained VTE from 3 prospective studies: the Atherosclerosis Risk in Communities Study (ARIC), the Cardiovascular Health Study (CHS), and the Reasons for Geographic and Racial Differences in Stroke study (REGARDS). We tested the association of race with VTE using Cox proportional hazard models adjusted for VTE risk factors. Over 438 090 person-years, 916 incident VTE events (302 in blacks) occurred in 51 149 individuals (17 318 blacks) who were followed up. In risk factor-adjusted models, blacks had a higher rate of VTE than whites in the CHS (hazard ratio, 1.81; 95% confidence interval, 1.20-2.73) but not ARIC (hazard ratio, 1.21; 95% confidence interval, 0.96-1.54). In REGARDS, there was a significant region-by-race interaction (P=0.01): Blacks in the Southeast had a significantly higher rate of VTE than blacks in the rest of the United States (hazard ratio, 1.63; 95% confidence interval, 1.08-2.48) that was not seen in whites (hazard ratio, 0.83; 95% confidence interval, 0.61-1.14).

CONCLUSIONS: The association of race with VTE differed in each cohort, which may reflect the different time periods of the studies or different regional rates of VTE. Further studies of environmental and genetic risk factors for VTE are needed to determine which underlie racial and perhaps regional differences in VTE.

VL - 129 IS - 14 U1 - http://www.ncbi.nlm.nih.gov/pubmed/24508826?dopt=Abstract ER -