Study population:

Post-menopausal women

a) For primary prevention average T-score was within 2 standard deviations of the mean for bone density

b) For secondary prevention in women who had experienced previous vertebral compression fractures

Comments:

Age range 42-85 but >62 for secondary prevention  
These NNTs apply to the first 5 years of treatment only

 

Outcome Duration NNT Annualised NNT
Vertebral secondary prevention 60 months (5 years)
Age NNT
65-69 16
70-74 13
75-79 9
80-84 12
85-89 11
90+ 8

 

Age NNT
65-69 80
70-74 65
75-79 45
80-84 60
85-89 55
90+ 40

 

Non-vertebral secondary prevention 60 months (5 years)
Age NNT
65-69 52
70-74 39
75-79 36
80-84 27
85-89 24
90+ 12

 

Age NNT
65-69 260
70-74 195
75-79 180
80-84 135
85-89 120
90+ 60

 

Hip secondary prevention 60 months (5 years)
Age NNT
65-69 210
70-74 86
75-79 36
80-84 21
85-89 9
90+ 8

 

Age NNT
65-69 1050
70-74 430
75-79 180
80-84 105
85-89 45
90+ 40