Letters

Criticisms of Swedish mammography trials were wrong

BMJ 1999; 319 doi: https://doi.org/10.1136/bmj.319.7221.1367 (Published 20 November 1999) Cite this as: BMJ 1999;319:1367
  1. Laszlo Tabar, director,
  2. Stephen W Duffy, senior scientist ([email protected])
  1. Mammography Department, Central Hospital, 97182 Falun, Sweden
  2. MRC Biostatistics Unit, Institute of Public Health, Cambridge CB2 2SR

    EDITOR—In their attempt to answer Rosén and Rehnqvist's criticism of their study,1 Sjönell and Ståhle inaccurately attack the Swedish randomised trials of breast cancer screening and in particular the two county study.2 They allege that the control group was invited to screening and that this was contrary to the trial protocol. In fact, the protocol stated that the control group was to be kept …

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