Relative risk versus absolute risk estimates of fracture

Age	Hip T-score	Relative risk	10-year fracture probability (%)
50	–2.5	17.6	1.7
80	–2.5	17.6	11.5

Relative risk compared with age-matched females with normal BMD.
(RR per SD change in BMD)^{T-score Difference} = (2.6)^2.5 = 17.6.

BMD: bone mineral density; RR: relative risk; SD: standard deviation.

10-year fracture probability from Swedish National Bureau of Statistics.
Data from: Marshall D, Johnell O, Wedel H. Meta-analysis of how well measures of bone mineral density predict occurrence of osteoporotic fractures. BMJ 1996; 312:1254 and Kanis JA, Johnell O, Oden A, et al. Ten year probabilities of osteoporotic fractures according to BMD and diagnostic thresholds. Osteoporosis International 2001; 12:989.

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Relative risk versus absolute risk estimates of fracture