The aim of the Euzkadi Project was to know the prevalence rate of cardiovascular disease and the high risk factors (hypertension, hypercholesterolemia and cigarette smoking) in the Basque Country to carry out an intervention trials to reduce these factors if we have collaboration of the Public Health Service. We have studied a sample of 4,800 men, 25-64 years old, randomly selected (1,600 men in each province), the examination was done by cardiologist using the cardiovascular questionnaire by Blackburn and Rose, the cholesterol was tested in WHO Collaborating Lipid Reference Center (Prague) and the electrocardiogram was studied by Minnesota Code. The rate of Atherosclerotic disease was 69%, coronary heart disease 49% (12% angina típica, 9% angina atípica and 28% myocardial infarction), stroke 7%, and peripheral vascular disease 13%. The rate of silent myocardial infarction was 31%. The rate of hypertension was 24%, hypercholesterolemia 14% and cigarette smoking 40%.