• Hayden B Bosworth, Benjamin Powers, Janet M Grubber, Carolyn T Thorpe, Maren K Olsen, Melinda Orr, and Eugene Z Oddone.
• Center for Health Services Research in Primary Care, Durham Veterans Affairs Medical Center (152), Durham, NC, USA. hayden.bosworth@duke.edu
• J Gen Intern Med. 2008 May 1; 23 (5): 692698692-8.

ObjectiveThe objective of the study was to identify potential explanatory factors for racial differences in blood pressure (BP) control.DesignThe design of the study was a cross-sectional studyPatients/ParticipantsThe study included 608 patients with hypertension who were either African American (50%) or white (50%) and who received primary care in Durham, NC.Measurements And Main ResultsBaseline data were obtained from the Take Control of Your Blood pressure study and included clinical, demographic, and psychosocial variables potentially related to clinic BP measures. African Americans were more likely than whites to have inadequate baseline clinic BP control as defined as greater than or equal to 140/90 mmHg (49% versus 34%; unadjusted odds ratio [OR] 1.8; 95% confidence interval [CI] 1.3-2.5). Among factors that may explain this disparity, being older, reporting hypertension medication nonadherence, reporting a hypertension diagnosis for more than 5 years, reporting high levels of stress, being worried about hypertension, and reporting an increased number of medication side effects were related to inadequate BP control. In adjusted analyses, African Americans continue to have poor BP control relative to whites; the magnitude of the association was reduced (OR = 1.5; 95% CI 1.0-2.1). Medication nonadherence, worries about hypertension, and older age (>70) continued to be related to poor BP control.ConclusionsIn this sample of hypertensive patients, there were a number of factors associated with poor BP control that partially explained the observed racial disparity in hypertension control including age, medication nonadherence, and worry about BP. Medication nonadherence is of particular interest because it is a potentially modifiable factor that might be used to reduce the racial disparity in BP control.

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