Epidemiologic studies are descriptive and analytical. The prevalence of ere
ctile dysfunction in various community studies has varied from as low of 7%
to as high as 52%. The prevalence of erectile dysfunction increases with a
ge. Incidence data are scarce but a recent study of white males in the Unit
ed States described an incidence of 26 cases per 1000 man-years. Risk facto
rs for erectile dysfunction include certain medications, such as cardiovasc
ular medications and psychotropic drugs, and chronic diseases, particularly
neurologic diseases and diabetes mellitus.