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Sensitivity = A divided by A + C; the probability of testing positive if disease is truly present

Specificity = D divided by B + D; the probability of testing negative if the disease is truly absen

Positive predictive value = A divided by A + B; the probability that a person who tests positive actually has the disease

Negative predictive value = D divided by C + D; the probability that a person who tests negative actually is free of the disease