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Required Formulas 2

Required Formulas - Biostatistics

TermDefinition
Risk # of subjects in group with unfavorable event / total # in group
Relative Risk RR = Risk in treatment group / risk in control group
Relative Risk Reduction RRR = (% risk in control group - % risk in treatment group) / % risk in the control group
Absolute Risk Reduction ARR = % risk in control group - % risk in treatment group
Number Needed to Treat or Harm NNT/NNH = 1/ARR* * expressed as a decimal ** Round NNT down, NNH up
Odds Ratio Exposure Outcome Present Outcome Absent Present A B Absent C D OR = AD/BC
Hazard Ratio HR = Treatment Group Hazard Rate/Control Group Hazard Rate
Incremental Cost-Effectiveness Ratio ICR = (C2-C1) / (E2-E1)
Created by: skelly46
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