The aim of this study is to describe the hospitalization and regional distribution of selected cardiovascular and thrombo-embolic events (cardiac infarction, cerebral strokes, deep vein thromboses, pulmonary embolism) of young women in Austria in the years 1993 and 1994, and to collect basic epidemiologic data for the study of the side effects of oral contraceptives. The calculated hospitalization rates are based on the Austrian hospitals' discharge records of 1993 and 1994. The persons concerned are women aged between 15 and 44 who live in Austria. The results of the study reveal that--in 1993--of the above mentioned group 51 out of 100,000 inhabitants were hospitalized because of the selected cardiovascular and thromboembolic events: 4/100,000 had a cardiac infarction, 5/100,000 had a stroke, 17/100,000 had a pulmonary embolism, and 27/100,000 suffered a deep vein thrombosis. In 1994 the counted cases per 100,000 inhabitants were 48, out of which 4/100,000 where cardiac infarcts, 5/100,000 strokes, 16/100,000 pulmonary embolism, and 25/100,000 deep vein thromboses.