Specificity = TN / (TN+FP)
Odds ratio = The odds of exposure to a risk factor in diseased patients, divided by the odds of exposure to a risk factor in undiseased patients.
Relative risk is the odds of exposure to a risk factor in diseased individuals, divided by the odds of exposure in the general population, aka diseased
For rare diseases and large patient numbers, the odds ratio and relative risk approximate.
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