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### 60 Cards in this Set

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 Sensitivity TP/(TP+FN) Probability that a person having a disease will be correctly identified Specificity TN/(TN+FP) Probability that a person who doesn't have a disease will be correctly identified Positive-Predictive Value TP/(TP+FP) Probability that an individual who tests (+) has the disease Negative-Predictive Value TN/(TN+FN) Probability that a person who tests (-) doesn't have the disease Prevalence TP+FN/(total # in study) Total number of cases in a population at a given time Incidence # new cases each year/*susceptible* population (ex: In a population of 100, there are 10 new cases of cat scratch fever every year. The prevalence of CSF in this population is 20. Therefore, the *incidence* of CSF in this population is 10/80) Relative Risk Used in cohort studies. (TP/TP+FP)/(FN/FN+TN) Odd Ratio Used in case-control studies (TP x TN)/(FPxFN) Mean average Median Middle value in sequentially ordered groups of #'s Mode # that appears most often in a group Positive skew peak is to the left mean>median>mode Negative skew peak is to the right mean