definition of prevalence
From Wikipedia, the free encyclopedia. Prevalence in epidemiology is the proportion of a population found to have a condition (typically a disease or a risk factor such as smoking or seat-belt use).ifetime prevalence (LTP) is the proportion of a population that at some point in their life (up to the time of assessment) have experienced the condition. Prevalence estimates are used by epidemiologists, health care providers, government agencies, and insurers.