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Epi Equations (2)
VM 608 Midterm
15
Veterinary Medicine
Professional
04/10/2012

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Cards

Term
Incidence
Definition
number of new cases/population at risk
Term
Prevalence
Definition
number of cases at a single point in time/population at risk
Term
Primary Attack Rate
Definition
number sick/number exposed
Term
Secondary Attack Rate
Definition
number of new cases/ true population at risk --- subtract primary cases from population to get true population at risk
Term
Mortality Rate
Definition
number of deaths/population at risk
Term
Case Fatality Rate
Definition
number of deaths due to disease A/number of cases of disease A
Term
Standardized Morbidity/Mortality Ratio
Definition
observed rate/expected rate
Term
Crude Mortality/Morbidity Rate
Definition
number of events/total population at risk (overall rate)
Term
Sensitivity
Definition
true test positive / total sick (see column)
Term
Specificity
Definition
true test negative / total not sick (see column)
Term
Positive Predictive Value
Definition
true test positive/total test positive (see row)
Term
Negative Predictive Value
Definition
true test negative/total test negative (see row)
Term
Odds Ratio
Definition
(AD)/(BC)
Term
Relative Risk
Definition
attack rate in exposed/attack rate in unexposed
Term
Attributable Risk
Definition
(attack rate in exposed) minus (attack rate in unexposed)
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