11.07.2015 Views

Clinical Trials

Clinical Trials

Clinical Trials

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<strong>Clinical</strong> <strong>Trials</strong>: A Practical Guide ■❚❙❘use log (RR) and its standard error to derive a Z-statistic and test the nullhypothesis using the following formula:log RRZ =SE(log RR)SE(log RR) = √1/a – 1/n 1+ 1/b – 1/n 2where SE(log RR) is the standard error of log RR [3].In the MI trial example:SE(log RR) = √1/110 – 1/2045 + 1/165 – 1/2022 = 0.12Z =log RR= log(0.66) = –3.46SE(log RR) 0.12This corresponds to a P-value of

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