# Shared Flashcard Set

## Details

Clinical Inquiry
Clinical Inquiry - Odds Ratio
13
Biology
03/21/2010

## Additional Biology Flashcards

Term
 Prevalence
Definition
 total number of cases of disease in a population
Term
 Cumulative Incidence
Definition
 risk of developing a condition during an interval of time, written as a percentage= # of new cases during an interval/ population at risk
Term
 Incidence density rate
Definition
 Person-time incidence rate = # of new cases during an interval/ people-years at risk
Term
 Person-time
Definition
 the sum of the time periods of observation for all individuals in the population at risk during the study time frame
Term
 Experimental Event Rate (EER)
Definition
 a measure of how often a particular statistical event occurs within the experimental group of an experiment
Term
 Cumulative Incidence Exposed
Definition
 risk that someone exposed will develop the condition
Term
 Control Event Rate (CER)
Definition
 a measure of how often a particular statistical event occurs within the control group of an experiment
Term
 Cumulative Incidence Un-exposed
Definition
 risk that someone not exposed will develop the condition
Term
 Relative Risk
Definition
 risk that someone who was exposed will develop a condition, relative to those unexposed RR = EER/CER
Term
 Relative Risk Reduction (RRR)
Definition
 amount of risk that has been REDUCED in getting a disease by not being exposed, relative to being exposed to some variableRRR = (CER-EER)/CER
Term
 Absolute Risk Reduction (ARR)
Definition
 Difference in risk (amount reduced) in getting a disease between the non-exposed and exposed groups ARR = CER - EER
Term
 Number Needed to Treat (NNT)
Definition
 NNT = 1/ARR How many people would you have to give treatment or the intervention to before you seee improvement in one person The lower the NNT the better the treatment must be
Term
 Odds Ratio
Definition
 odds of event occurring in one group relative to odds of it occurring in another group-used for case control studies
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