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calcul - okt3
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03-27-2008, 08:16 PM
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NNT=1/ARR ARR=event rate in placebo group-event rate in treatment group arr=15/100-5/100=10/100 NNT=100/10=10
03-27-2008, 08:19 PM
Choice © is the correct answer. Number needed to treat is defined as the reciprocal of the absolute risk reduction. Absolute risk reduction is defined as the difference in the rate of an event in the control group minus the rate of an event in the treatment group. In this example, the treatment group is the group receiving medication X, and the control group is the group receiving placebo. The event being measured is the number of fractures over a 12 month period. The rate of fractures in the treatment group is 5/100, and the rate of fractures in the control group is 15/100. So, (15/100) - (5/100) = 10/100 or 10%. The reciprocal of 10% is 1/0.1 = 10, which is the number needed to treat. In other words, 10 women aged 67 would have to be treated with medication X over 12 months to prevent 1 fracture
03-27-2008, 08:23 PM
if u know the formula, it is easy, I got it right w/o any problemo
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