laura81
Forum Elite
Topics: 32
Posts: 176
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A study is done to determine if raloxifene will decrease the incidence of vertebral fractures in postmenopausal women. The results are shown:
Raloxifene Placebo
Number of women in study group 2557 2576
Number of vertebral fractures 138 (5.4%) 260 (10.1%)
Based on these results, how many women need to be treated to prevent one vertebral fracture?
A ) 100/5.4 = 18.5
B ) 100/10.1 = 10
C ) 100/(10.1+5.4) = 6.5
D ) 100/(10.1–5.4) = 21
E ) 100/(10.1×5.4) = 2
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| robin082006
Forum Hero
Topics: 471
Posts: 5,123
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Number needs to be treated = 1/(death in unexposed - death in exposed) = 1/(10.1%-5.4%)=1/4.7%=21,
Answer D
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