04-11-2015, 09:53 AM
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
.....................................................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
