Cumulative incidence: Difference between revisions

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Revision as of 15:15, 21 December 2011

Overview

'Cumulative incidence (sometimes referred to as incidence proportion) is a measure of disease frequency which counts the proportion of a candidate population that becomes diseased/develops disease over a specified period of time. Cumulative incidence measures occurrence of new cases of disease. It involves the transition from one state to another, such as non-disease to diseased state (incidence of disease) or diseased to non-diseased (incidence of cure).

Specific forms of cumulative incidence include:

Crude mortality rate: number of deaths due to any cause/100,000 population during a specified time period
Infant mortality rate: number of infant deaths due to any cause/1,000 population during a specified time period
Morbidity rate: number of illnesses due to any cause/1,000 population during a specified time period
Live birth rate: number of live births/1,000 population or childbearing women during a specified time period
Case fatality rate: number of deaths due to disease X/number of people with disease X during a specified time period
Attack rate: number of new cases of disease/number population at risk at beginning of time period during specified time period

Calculating Cumulative Incidence

It may also be calculated by the incidence rate multiplied by duration.

'Basic equation:' Cumulative Incidence = # new (incident) cases/total population at risk 'Applied:' CI = IR_i * t_i (where IR_i is the incidence rate, t_i is the specified time period)

References

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 {{SI}}
-{{EH}}
-'''Cumulative incidence''' is a measure of frequency, as in [[epidemiology]], where it is a measure of disease frequency during a period of time.
+==Overview==
+'''Cumulative incidence''' (sometimes referred to as '''incidence proportion''') is a measure of disease frequency which counts the proportion of a candidate population that becomes diseased/develops disease over a specified period of time. Cumulative incidence measures occurrence of '''new cases'' of disease. It involves the transition from one state to another, such as non-disease to diseased state (incidence of disease) or diseased to non-diseased (incidence of cure).
-Cumulative incidence is the incidence calculated using a period of time during which all of the individuals in the population are considered to be at risk for the outcome.
+Specific forms of cumulative incidence include:
-It is sometimes referred to as the incidence proportion or the attack rate.
+* Crude mortality rate: number of deaths due to any cause/100,000 population during a specified time period
+* Infant mortality rate: number of infant deaths due to any cause/1,000 population during a specified time period
+* Morbidity rate: number of illnesses due to any cause/1,000 population during a specified time period
+* Live birth rate: number of live births/1,000 population or childbearing women during a specified time period
+* Case fatality rate: number of deaths due to disease X/number of people with disease X during a specified time period
+* Attack rate: number of new cases of disease/number population at risk at beginning of time period during specified time period
-Cumulative incidence is calculated by the number of new cases during a period divided by the number of people at risk in the population at the beginning of the study.
+==Calculating Cumulative Incidence==
+It may also be calculated by the [[incidence rate]] multiplied by duration.
-It may also be calculated by the [[incidence rate]] multiplied by duration.
+''''Basic equation:'''' Cumulative Incidence = # new (incident) cases/total population at risk
+''''Applied:'''' CI = IR<sub>i</sub> * t<sub>i</sub> (where IR<sub>i</sub> is the incidence rate, t<sub>i</sub> is the specified time period)
-<math>CI(t)=1-e^{-IR(t) * D}\,</math>
+==References==
+{{reflist|2}}
-{{SIB}}
 [[Category:Epidemiology]]

Cumulative incidence: Difference between revisions

Revision as of 15:15, 21 December 2011

Overview

Calculating Cumulative Incidence

References

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