Intended for healthcare professionals

Letters Observational studies

More than high standards needed

BMJ 2007; 335 doi: (Published 01 November 2007) Cite this as: BMJ 2007;335:900
  1. Guy Lloyd, consultant cardiologist
  1. Eastbourne District General Hospital, Eastbourne BN21 2UD
  1. lloyd.cardiol{at}

    Von Elm et al provide a welcome set of criteria to judge prospective observational studies.1 What they do not include is the government health warning that should accompany such publications. The accompanying editorial highlights the usefulness of these studies to examine rare diseases,2 but such studies are often used for common illnesses like cardiovascular disease and cancer. End points are …

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