Epidemiology UNF: Formulas – Flashcards
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Cumulative Incidence
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# new cases of dis during spec time period __________________________________ # of individuals at risk at start of period
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Incidence Rate
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# of new cases of dis during spec time period _________________________________ Person-time of observation among people at risk during same period
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Period Prevalence
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# of diseased in pop over a spec period __________________________________ Total pop at start (or midpoint) of spec period
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Point Prevalence
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# of diseased in pop at a spec time __________________________________ Tot pop at same spec time
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Attack Rate
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# of people who ate a certain food and became ill __________________________________ Total # people who ate that food
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Case Fatality Rate
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# people dying of dis during spec period after onset __________________________________ Total # with dis
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Mortality Rate
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Tot # of deaths from all (or spec) causes in one year __________________________________ Tot # of deaths in pop at midyear
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SMR: Standardized Mortality (morbidity) Ratio
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Observed # deaths (cases) per year __________________________________ Expected # of deaths (cases) per year
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Relative Risk
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a/(a+b) --------- c/(c+d)
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Odds Ratio
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a/c ad --- = ---- b/d bc
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Attributable Risk
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Risk in exposed - Risk in unexposed
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Attributable Risk
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(a/(a+b)) - (c/(c+d))
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AR (Population)
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((a+c)/N) - (c/(c+d))
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AR Fraction
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Risk in the exposed - Risk in the unexposed ---------------------------- Risk in the exposed
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AR Percent (Population)
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Risk in the population - Risk in the unexposed ---------------------------- Risk in the population
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Death Rate
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# deaths divided / tot person-time
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Sensitivity
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a/(a+c)
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Specificity
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d/(b+d)
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Pos Predictive Value
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a/(a+b)
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Neg Predictive Value
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d/(c+d)
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Who's gonna rock these formulas?
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You are!
