Intended for healthcare professionals


Do enforced bicycle helmet laws improve public health?: Evidence is conflicting

BMJ 2006; 332 doi: (Published 06 April 2006) Cite this as: BMJ 2006;332:852
  1. Tony Raven, cyclist (
  1. Melbourn, Royston, Hertfordshire SG8 6BN

    EDITOR—Hagel et al cite six, mostly old, “independent” studies that support their views.1 Two are their own and another, after correction of an agreed mathematical error finds that helmets provide 186% protection—a clear case of major confounding.

    Curiously they omit any reference to the many studies that don't support their views. For example, there is no reference to …

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