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Formula for Sensitivity?
 Proportion of diseased popylation with positive test results
 TP/(TP + FN)

Mnemonic for sensitivity and specificity

Confidence intervals
If the 95% confidence interval crosses zero for a treatment, then it is NOT significant.
If a 95% confidence interval crosses 1 for a relative risk or odds ratio, then it is NOT significant

Number Needed to Treat
 1/(absolute risk reduction)
 1/(rate in placebo group minus rate in treatment group)

Number Needed to Harm
 The number needed to harm (NNH) is the number of pts who get a drug or intervention for each patient harmed.
 1/(rate harmed in treatment group  rate in placebo group)

Relative Risk
divide the incidence with exposure by the incidence without exposure
Incidence with exposure ÷ incidence without exposure

Attributable Risk
subtract incidence with exposure from incidence without exposure
Incidence with exposure  Incidence without exposure

Formula for Specificity?
TN / TN + FP