Published online before print December 19, 2005, doi: 10.1161/CIRCULATIONAHA.105.580696
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(Circulation. 2006;113:30-37.)
© 2006 American Heart Association, Inc.
Epidemiology |
Distribution of Coronary Artery Calcium by Race, Gender, and Age
Results from the Multi-Ethnic Study of Atherosclerosis (MESA)
From the Department of Biostatistics, University of Washington, Seattle (R.L.M., H.C., R.A.K.); Division of Cardiology, Harbor–UCLA Medical Center, Los Angeles, Calif (R.D.); and Division of Cardiology, Department of Medicine, Johns Hopkins University, Baltimore, Md.
Correspondence to Robyn McClelland, Collaborative Health Studies Coordinating Center, Department of Biostatistics, University of Washington, Bldg 29, Suite 310 6200, NE 74th St, Seattle, WA 98115. E-mail rmcclell{at}u.washington.edu
Received August 3, 2005; revision received October 12, 2005; accepted October 31, 2005.
Background— Coronary artery calcium (CAC) has been demonstrated to be associated with the risk of coronary heart disease. The Multi-Ethnic Study of Atherosclerosis (MESA) provides a unique opportunity to examine the distribution of CAC on the basis of age, gender, and race/ethnicity in a cohort free of clinical cardiovascular disease and treated diabetes.
Methods and Results— MESA is a prospective cohort study designed to investigate subclinical cardiovascular disease in a multiethnic cohort free of clinical cardiovascular disease. The percentiles of the CAC distribution were estimated with nonparametric techniques. Treated diabetics were excluded from analysis. There were 6110 included in the analysis, with 53% female and an average age of 62 years. Men had greater calcium levels than women, and calcium amount and prevalence were steadily higher with increasing age. There were significant differences in calcium by race, and these associations differed across age and gender. For women, whites had the highest percentiles and Hispanics generally had the lowest; in the oldest age group, however, Chinese women had the lowest values. Overall, Chinese and black women were intermediate, with their order dependent on age. For men, whites consistently had the highest percentiles, and Hispanics had the second highest. Blacks were lowest at the younger ages, and Chinese were lowest at the older ages. At the MESA public website (http://www.mesa-nhlbi.org), an interactive form allows one to enter an age, gender, race/ethnicity, and CAC score to obtain a corresponding estimated percentile.
Conclusions— The information provided here can be used to examine whether a patient has a high CAC score relative to others with the same age, gender, and race/ethnicity who do not have clinical cardiovascular disease or treated diabetes.
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