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The Atherosclerosis Risk in Communities Study (ARIC), sponsored by the National Heart, Lung and Blood Institute (NHLBI), is a prospective epidemiologic study conducted in four U.S. communities. ARIC is designed to investigate the causes of atherosclerosis and its clinical outcomes, and variation in cardiovascular risk factors, medical care and disease by race, gender, location, and date. To date, the ARIC project has published over 2,000 articles in peer-reviewed journals.
ARIC includes two parts: the Cohort Component and the Community Surveillance Component.
The Cohort Component began in 1987, and each ARIC field center randomly selected and recruited a cohort sample of approximately 4,000 individuals aged 45-64 from a defined population in their community. A total of 15,792 participants received an extensive examination, including medical, social, and demographic data. Participants like you are reexamined periodically with the first screen (baseline) occurring in 1987-89, the second in 1990-92, the third in 1993-95, the fourth in 1996-98, the fifth in 2011-13, the sixth in 2016-17 and the seventh in 2018-19. Follow-up also occurs annually and semi-annually by telephone to maintain contact with you and to assess your recent health status over the phone. The cohort continues to be followed for hospitalized myocardial infarction and coronary heart disease deaths, strokes and heart failure.
Below is a representation of the participant contact over the years:

Graph of ARIC Exam History

In the Community Surveillance Component, these four communities were investigated to determine the community-wide occurrence of hospitalized myocardial infarction and coronary heart disease deaths in men and women aged 35-84 years between 1987-2014. Starting in 2006, the study conducted community surveillance of hospitalized heart failure events in men and women ages 55 years and older, starting with event years 2005 through the end of 2014.