Letters

Use individual event rate adjustment for follow up time

BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6992.1469b (Published 03 June 1995) Cite this as: BMJ 1995;310:1469

This article has a correction. Please see:

  1. Kalevi Laitinen
  1. Medical adviser Leiras Oy, PO Box 325, FIN-00101 Helsinki, Finland

    EDITOR,—We agree with Jurgen Windeler and Stefan Lange about the importance of correct analysis of data on fractures and that the widely used sample statistic events per person year may lead to flawed results.1 The reason is, as the authors point out, that the data may include more than one event (fracture) in the same patient and these events do not fulfil the criteria of independence, which is the basic assumption for the usual statistical tests of rates. The idea that statistical analyses can be performed …

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