Letters

Environmental lead and children's intelligence

BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6976.397 (Published 11 February 1995) Cite this as: BMJ 1995;310:397

Obvious hypothesis is ignored

  1. Robin Russell Jones
  1. Former chairman, Campaign for Lead Free Air St Thomas's Hospital, London SE1 7EH

    EDITOR,—Stuart J Pocock has always been profoundly sceptical of a causal relation between lead and IQ.1 Accordingly, the recent paper by him and colleagues deserves a cautious welcome, if only because the data show conclusively that a doubling of body lead from 10 to 20 μg/dl of blood (0.48 to 0.97 μmol/l) or 5 to 10 μg/g of tooth is associated with an IQ deficit of …

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