Reduction in mortality from breast cancer

BMJ 2005; 330 doi: https://doi.org/10.1136/bmj.330.7498.1025 (Published 28 April 2005) Cite this as: BMJ 2005;330:1025

Authors' reply

  1. Elsebeth Lynge, professor,
  2. Anne Helene Olsen, statistician (Ann_epi@hotmail.co.uk)
  1. Department of Epidemiology, University of Copenhagen, Blegdamsvej 3, DK-2200 Copenhagen N, Denmark
  2. CR-UK Centre for Epidemiology, Mathematics and Statistics, Charterhouse Square, London EC1M 6BQ

    EDITOR—Unfortunately, Zahl and Mæhlen have misunderstood the design of our study, which is essential for the correct interpretation of the data. Our analysis is not a simple comparison of breast cancer mortality in Copenhagen before and after screening was introduced, but it also uses the data from the rest of …

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