Epi and biostats formulas

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7 Terms

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Prevalence

existing cases / total population

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Cumulative incidence

new cases / at-risk population, over a stated time period

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Incidence rate (IR)

(new cases / total person years at risk) x 100,000= rate per 100,000 person years

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Incidence rate ratio (IRR)

IR in exposed / IR in unexposed

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Incidence rate difference

IR in exposed - IR in unexposed

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Percent change from an IRR

(IRR - 1) x 100 (positive = % increase; negative = % decrease

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Odds ratio (OR)

(a x d) / (b x c), where a= exposed cases, b= exposed controls, c= unexposed cases, d= unexposed controls