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### 13 Cards in this Set

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 The number of ALL cases in a given time period Prevalence The number of new cases in a given time Incidence subset of population at risk target population Way to find out which people in a population have a disease compared to those who do not. Screening Number of truly diseased people who test positive for the disease =(True Positives)/(True Positive + False Negative) Sensitivity Number of truly non-diseased people who test negative for the disease =(True Negatives)/(False Positive + True Negative) Specificty Probability that a person with a positive test is a true positive Positive predicted value Probability that a person with a negative test is a true negative Negative predicted value Association between exposure to a particular factor and risk of a certain outcome Relative risk Relative Risk Ration (RRR) Incidence rate among exposed/incidence rate among unexposed =A/C True Positive/False Negative The difference between the incidence rate among the exposed and the incidence rate among the unexposed Absolute Risk Reduction (ARR) Attributable risk reduction ARR = (A-C)/A+C Numbers Needed to Treat NNT NNT = 1/ARR Ie: average number of patients that a doc would need to treat in order to prevent outcome. Reanalysis and statistically cross-references multiple studies Meta-analysis Gives significance to studies that couldn't stand alone on their own merits Critics say try to correlate apples and oranges.