July 2004
ACP Journal Club;Jul/Aug2004, Vol. 141 Issue 1, pA19
Academic Journal
The authors were deemed not to have taken adequate measures to conceal allocation to study groups from those responsible for assessing patients for entry in the trial. RRI (relative risk increase): the increase in rates of bad events, comparing experimental patients to control patients in a trial, and calculated as for RBI. RRI is also used in assessing the effect of risk factors for disease. ARI (absolute risk increase): the absolute difference in rates of bad events, when the experimental treatment harms more patients than the control treatment. NNH (number needed to harm): the number of patients who, if they received the experimental treatment, would lead to 1 additional person being harmed compared with patients who receive the control treatment.


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