累積發病率(英語:cumulative incidence),或稱為發病比incidence proportion),在流行病學中是指在一段時期內特定人群發生疾病的比例,用來測定發病風險。當所考慮的時期為整個人生時,則稱為終生風險lifetime risk)。[1]

累積發病率可由所選定時期中新發病例數除以所研究的風險人口數得到。此外也可以由發病率計算:

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