In current use, incidence usually means "rate of occurrence" and is often qualified in some way ("a high incidence of bear sightings"). Incident usually refers to a particular event, often something unusual or unpleasant ("many such incidents go unreported").

In epidemiology, incidence reflects the number of new cases of a given medical condition in a population within a specified period of time. Incidence proportion (IP), also known as cumulative incidence, is defined as the probability that a particular event, such as occurrence of a particular disease, has occurred in a specified period: [1]

Nov 6, 2020 · Incidence = the rate of new cases of a disease occurring in a specific population over a particular period of time. Two types of incidence are commonly used: ‘incidence proportion’ and ‘incidence rate’.

Aug 12, 2022 · Because of these difficulties in measuring incidence, many health statistics are instead measured in terms of prevalence. (Also see Sources and Definitions, Prevalence .) Last Reviewed: August 12, 2022

Apr 10, 2023 · Incidence is the rate of new cases or events over a specified period for the population at risk for the event. In medicine, the incidence is commonly the newly identified cases of a disease or condition per population at risk over a specified timeframe.[1]

Jan 9, 2025 · Incidence describes the current risk of getting a certain disease, while prevalence tells us how many people currently live with the condition, regardless of when (or even whether) they've been diagnosed with that particular disease.

INCIDENCE definition: 1. the rate at which something, especially a disease, happens: 2. the fact of a ray of light…. Learn more.

Cumulative incidence measures the proportion of a population that develops a disease over a specified period, while incidence rate (also called incidence density, though rarely) accounts for the exact timing of new cases, using person-time in its calculation.

Jun 15, 2023 · Incidence is the number of new cases of a condition, symptom, death, or injury that develop during a specific time period, such as a year.

Offering a helpful definition of incidence in epidemiology, the National Center for Health Statistics (NCHS) describes this as the "number of cases of disease having their onset during a prescribed period of time."