Letter

Authors' reply

BMJ 1995; 311 doi: 10.1136/bmj.311.7015.1301a (Published 11 November 1995)
Cite this as: BMJ 1995;311:1301.2

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  1. Juliet Compston,
  2. Cyrus Cooper,
  3. John Kanis
  1. Honorary consultant physician Department of Medicine, University of Cambridge Clinical School, Addenbrooke's Hospital, Cambridge CB2 2QQ
  2. Reader in rheumatology MRC Epidemiology Unit, Southampton General Hospital, Southampton SO16 6YD
  3. Professor of human metabolism and clinical biochemistry University of Sheffield Medical School, Sheffield S10 2RX

    EDITOR,--We agree with Andrew Simmons and colleagues about the need to standardise reference values for bone densitometry; differences between manufacturers' reference data have been reported previously,1 as have differences in reference data from different centres in Britain.2 The number and selection of subjects on whom these data are based and geographic differences in bone density will affect the absolute values measured, the pattern of changes related to …

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