Epidemiology researches on the frequency, spread and determinants of health and illness by examining population or sections of population. It analyses probable links between risk factors, strains on health or circumstances of life and the occurrence of diseases.In our institute we are carrying out numerous population-based, register-based and clinical epidemiological studies. The institute possesses an own study centre to examine the participants of the National Cohort. The data is analysed within a great number of research projects with different foci e.g. cardiovascular epidemiology, epidemiology of neurological-psychiatric disorders, clinical epidemiology and research on health care provision.