Prevalence Prevalence is the proportion of the population that has a disease, such as diabetes, hypertension, or heart disease.
Prevalence of Type II Diabetes in NHANES 1. 13,247 Black and White Participants aged 25-74 731 had Type II Diabetes
Incidence Incidence tells us how many newcases of disease occur in some time period. It is usual to consider incidence among those with no previous history of disease.
Example There were 1,148 men free of CHD at the fourth biennial exam of the Framingham Study. In the subsequent 10 years, 186 of the developed CHD.