Incidence rate = new cases per person-time; prevalence = existing cases per population at a time point. Relation at steady state: prevalence ≈ incidence × mean duration. Distinguish lifetime, period, and point prevalence.
Incidence rate = new cases per person-time; prevalence = existing cases per population at a time point. Relation at steady state: prevalence ≈ incidence × mean duration. Distinguish lifetime, period, and point prevalence.