Key result
Recent birth cohorts are linked to up to ~61% lower CVD incidence among American Indians.
Why the study?
American Indians experience high rates of cardiovascular disease, but whether cardiovascular disease incidence, mortality, and prevalence changed over 25 years among individuals aged 30 to 85 was unknown.
Cohort (n=5,627)
Over a 25-year period, cardiovascular disease incidence declined across generations in American Indians, with mortality declining more in men and prevalence declining more in women.
Answers are grounded in this paper and cite their sources.
CVD incidence decline among American Indians supports sustained prevention efforts; extends prior observational data across birth cohorts but should not yet alter guidelines.
Background American Indians experience high rates of cardiovascular disease. We evaluated whether cardiovascular disease incidence, mortality, and prevalence changed over 25 years among American Indians aged 30 to 85. Methods and Results The SHS (Strong Heart Study) and SHFS (Strong Heart Family Study) are prospective studies of cardiovascular disease in American Indians. Participants enrolled in 1989 to 1990 or 2000 to 2003 with birth years from 1915 to 1984 were followed for cardiovascular disease events through 2013. We used Poisson regression to analyze data for 5627 individuals aged 30 to 85 years during follow-up. Outcomes reflect change in age-specific cardiovascular disease incidence, mortality, and prevalence, stratified by sex. To illustrate generational change, 5-year relative risk compared most recent birth years for ages 45, 55, 65, and 75 to same-aged counterparts born 1 generation (23-25 years) earlier. At all ages, cardiovascular disease incidence was lower for people with more recent birth years. Cardiovascular disease mortality declined consistently among men, while prevalence declined among women. Generational comparisons were similar for women aged 45 to 75 (relative risk, 0.39-0.46), but among men magnitudes strengthened from age 45 to 75 (relative risk, 0.91-0.39). For cardiovascular disease mortality, risk was lower in the most recent versus the earliest birth years for women (relative risk, 0.56-0.83) and men (relative risk, 0.40-0.54), but results for women were inconclusive. Conclusions Cardiovascular disease incidence declined over a generation in an American Indian cohort. Mortality declined more for men, while prevalence declined more for women. These trends might reflect more improvement in case survival among men compared with women.
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Muller et al. (2019) conducted a cohort in Cardiovascular disease (n=5,627). More recent birth cohort vs. Earlier birth cohort (23-25 years earlier) was evaluated on Age-specific cardiovascular disease incidence (RR 0.39-0.46 (women) and 0.91-0.39 (men)). Being born in a more recent generation was associated with lower cardiovascular disease incidence among American Indians compared to those born 23-25 years earlier (RR 0.39-0.46 for women, 0.39-0.91 for men).
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