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Dual x ray absorptiometry is the reference method to measure bone mineral density (BMD) accurately and reproducibly. The World Health Organization defines osteoporosis on the basis of the T score (which is the difference between the measured BMD and the mean value of young adults, expressed in standard deviations for a normative population of the same ethnicity).1 Although the BMD at different anatomical regions is correlated, the agreement between sites is low when it comes to classifying individual subjects as having osteoporosis.2 Various studies have analysed the prevalence and effect of T score discordance on the management of osteoporosis.3–,7 However, most of these studies did not evaluate risk factors for this phenomenon. …
Competing interests: None declared.
Published Online First 23 October 2006
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