Abstract P278: Life's Simple 7 and Risk of Incident Stroke in Black and White Americans: REasons for Geographic And Racial Differences in Stroke (REGARDS) Study

Abstract

Background: The American Heart Association has developed Life’s Simple 7 (LS-7) as a measure of cardiovascular health. In a recent study, LS-7 showed a graded relationship with cardiovascular disease incidence. The association of LS-7 with incident stroke has not been reported previously. Methods: We analyzed data from REGARDS, a national population-based cohort of 30,239 blacks and whites, aged ≥ 45 years of age, sampled from US population between 2003 and 2007. Data for LS-7 was collected by telephone, mail questionnaires, and an in-home exam. Participants were contacted every 6 months for possible stroke, which was validated by physicians using medical record review. LS-7 components (blood pressure, cholesterol, glucose, BMI, smoking, physical activity, diet) were each coded as: poor (1 point), intermediate (2 points) and ideal (3 points). An overall LS-7 score, created by summing the 7 component scores (possible range: 7 to 21), was categorized as: highest (17–21), medium (12–16) and lowest (7–11) cardiovascular health. Cox regression was used to model LS-7 score categories with stroke events. Results: There were 22,914 participants with data on LS-7 and no previous CVD. Mean age was 65 years, 40% were black, and 55% female. Over 4.9 years of follow-up, there were 432 incident strokes. Mean (SD) LS-7 score was 13.5 (2.5). After adjustment for age and sex, mean LS-7 scores were lower for blacks (12.9 ± 0.02) than whites (14.3 ± 0.02). LS-7 categories were associated with incident stroke in a graded fashion (figure). After adjusting for age, race, sex, income, and education, each better health category was associated with a 25% lower risk of incident stroke (HR=0.75, 95% CI = 0.63, 0.90). In stratified analyses, HR was similar for blacks and whites (p-value = 0.55). Conclusion: Blacks had lower levels of cardiovascular health factors than whites. Better cardiovascular health based on LS-7 score was associated with a lower risk of stroke. Results suggest that efforts to improve the LS-7 score may be useful for stroke prevention.