The Post CABG Biobehavioral Study examined a cohort of 759 coronary artery bypass patients (269 women and 490 men) who were enrolled at five clinical centers. Sociodemographic and medical data were obtained by interview and from medical charts. Health-related quality of life and psychosocial data were ascertained preoperatively by interview and questionnaire for those patients whose condition allowed preoperative assessment and was compared among patients from hospitals enrolling both male and female patients.