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WHO Criteria

The World Health Organization (WHO) has defined criteria for assessing bone status and determining the risk of fracture (osteoporosis)*. These criteria are defined by "T-score," which is the number of standard deviations by which a subject's result exceeds
(positive T-score) or falls below (negative T-score) the mean of the young adult group.

 Normal healthy bone  =        -1<T-Score
 Osteopenia  =        -2.5 <T-Score <-1
 Osteoporosis  =        T-Score <-2.5
 Severe Osteoporosis  =        T-score <-2.5 and an evidence   
      of a low trauma fracture

Database Comparison
An examination of the Omnisense reference databases shows that the WHO criteria for the definition of osteoporosis can be applied to Omnisense measurements. When comparing reference data curves of various bone assessment devices in terms of T-score, we find that the Omnisense database indicates a prevalence of osteoporosis among post-menopausal women similar to that identified by the WHO Study Group that defined the criteria for osteoporosis. The relevance of the Omnisense database can be demonstrated by the fact that Omnisense radius reference curve crosses the -2.5 T-score level at the same age range as that of DXA of the spine and forearm, as shown in the graph below.

1.The curves of the L2-L4 spine DXA, the forearm DXA, and Omnisense radius cross
    the -2.5 threshold at around the age of 75.

2.Omnisense prevalence of osteoporosis is around 35% in the 60-90 North American
    female population age group.

*"Assessment of Fracture Risk and its Application to Screening for Postmenopausal Osteoporosis," Report of a WHO Study Group, WHO Technical Report Series #843, World Health Organization, Geneva 1994; M. Weiss.

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