[Four numbers and basic knowledge of mathematics].
Results of clinical trials are presented in different expressions of risks: baseline risk, relative risk (RR), relative risk reduction (RRR), absolute risk reduction (ARR), or risk difference (RD). In this article of our series about the basics of evidence-based medicine we show how results of clinical trials are calculated based on the 2 x 2-table. The 2 x 2-table usually contains all information needed to calculate the main study results. Adequate interpretation of the results/treatment effects is the basis for evidence-based advices in pharmaceutical practice.
Katja
K
Suter
Matthias
M
Briel
Judith
J
Günther
D002986:Clinical Trials as Topic / Q000706:statistics & numerical data*; D003627:Data Interpretation, Statistical; D019317:Evidence-Based Medicine; D006801:Humans; D008433:Mathematics; D010604:Pharmacy / Q000592:standards; D018570:Risk Assessment; D040242:Risk Reduction Behavior