Faculty of Health and Medical Sciences

Appraise the evidence

Study type: Therapy or Prevention

Learn more about:


Validity

Click on each heading below for more information.

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Clinical importance

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Applicability

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EBP calculations

What is the Control Event Rate in the trial? (CER)

What is the Experimental Event Rate in the trial? (EER)

Relative risk reduction (RRR) = CER - EER
                                                                CER

Absolute risk reduction (ARR) = CER – EER

Number needed to treat (NNT) =     1    
                                                             ARR


Further information: Glossary; Resources - Advanced concepts; Links - University of British Columbia online Clinical Significance Calculator

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Critical trial of therapy or prevention:
Basic critical appraisal
Advanced critical appraisal