 This study will use previously collected data from participants in the Multi-Ethnic Study of Atherosclerosis MESA study, a study that examined characteristics of the subclinical, or the early stages of, cardiovascular disease in individuals. There will be no study visits specifically for this study. Participants study data and computed tomography CT scans will be analyzed to determine the following: 1 the presence of pericardial fat and subclinical CHD at study entry; 2 changes in pericardial fat levels and plaque formation; and 3 the presence of pericardial fat and CHD at a 6-year follow-up visit. 