Letter

Inappropriateness of randomised trials for complex phenomena

BMJ 2005; 330 doi: 10.1136/bmj.330.7482.94-a (Published 6 January 2005)
Cite this as: BMJ 2005;330:94.2

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Single trial is never enough evidence to base decisions on

  1. Isabelle Boutron, research fellow (Isabelle.boultron@bch.ap-hop-paris.fr),
  2. Philippe Ravaud, head,
  3. Bruno Giraudeau, assistant professor
  1. Département d'Epidémiologie, Biostatistique et Recherche Clinique, INSERM EMI 0357, Groupe Hospitalier Bichat-Claude Bernard (AP-HP), Faculté de Médecine Xavier Bichat, Université Paris VII, 46 rue Henri Huchard, 75877 Paris, France
  2. Département d'Epidémiologie, Biostatistique et Recherche Clinique, INSERM EMI 0357, Groupe Hospitalier Bichat-Claude Bernard (AP-HP), Faculté de Médecine Xavier Bichat, Université Paris VII, 46 rue Henri Huchard, 75877 Paris, France
  3. INSERM CIC 202, Tours, France

    EDITOR—Kotaska outlines the importance of care providers' skill and the experience of a unit when assessing non-pharmacological treatments such as vaginal breech delivery in randomised trials.1 We agree that evaluation of non-pharmacological treatment raises specific methodological issues, including the skill of care providers.2

    Care providers are part of the intervention to …

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