Committee's action has compromised continuing studies

BMJ 1995; 311 doi: https://doi.org/10.1136/bmj.311.7020.1639 (Published 16 December 1995) Cite this as: BMJ 1995;311:1639
  1. M William L Davis,
  2. Michael Lewis,
  3. Linda De Caestecker,
  4. Ronald Mann
  1. Acting director Associate director Potsdam Institute of Pharmacoepidemiology and Technology Assessment, D-14482 Potsdam, Germany
  2. Director, Glasgow centre, transnational study Department of Public Health, Glasgow University, Glasgow G12 8QQ
  3. Director, Southampton centre, transnational study Drug Safety Research Unit, Southampton University, Southampton SO13 1AA

    EDITOR,--Douglas Carnall's report of the controversy over whether the third generation contraceptive pills are associated with an increased risk of thrombosis contains an error that illustrates how bias may arise in a case-control study such as that led by Professor Walter Spitzer.1 Carnall states that the study “matches …

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