To better understand the role of hormones and heart disease, the investigators propose to look at markers of heart disease in healthy women and compare this to their natural hormone levels. One of the markers known to be related to heart disease is carotid artery intima-medial thickness (c-IMT) which can be measured by creating an ultrasound picture of an artery in the neck. The investgators will use c-IMT scans and serum blood samples from women in the NIH-sponsored Los Angeles Atherosclerosis Study (LAAS), a large epidemiologic study that followed participants for 8 years. The proposed study will use risk factor information, serum samples and c-IMT scans collected from the female participants (about 269 women) over the 8 years of follow-up. The total sample size is 269 subjects, each of whom donated 3 blood specimens for the LAAS study. This research will examine those specimens (800 in total). It will also measure other markers of heart disease, including inflammation (hsCRP) and diabetes (insulin and glucose). All information has been obtained and there will be no need to collect additional information from participants nor additional blood specimens.