in each subgroup is shown in Table 1. The sample predominantly included participants with European ancestry (EA: 65.08%) and African ancestry (AA: 32.29), in addition to a small fraction with Hispanic ancestry (HA: 2.62%). Data from six collection centers have been included in this study: SUNY Downstate Medical Center at Brooklyn, New York; University of Connecticut Health Science Center; Washington University School of Medicine in St. Louis; University of California at San Diego; University of Iowa, and Indiana University School of Medicine. Recruitment and assessment procedures have been described elsewhere (Begleiter et al., 1995; Reich, 1996) and are also available at this website: https://zork5.wustl.edu/coganew/data/instruments.html.
