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Formula for Sensitivity?
Proportion of diseased popylation with positive test results
TP/(TP + FN)
Mnemonic for sensitivity and specificity
If the 95% confidence interval crosses zero for a
, 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)
divide the incidence with exposure by the incidence without exposure
Incidence with exposure ÷ incidence without exposure
subtract incidence with exposure from incidence without exposure
Incidence with exposure - Incidence without exposure
Formula for Specificity?
TN / TN + FP