Data were collected on date of birth, weight, cigarette smoking, menopausal status and current interim use of post-menopausal hormones. Data were also collected on incident cases of non-fatal myocardial infarction, stroke, pulmonary embolism, and angina pectoris. These items appeared on each questionnaire. In addition, nutritional parameters were assessed by a self-administered semi-quantitative food frequency questionnaire in 1986 and again in 1990.