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Authors' reply

BMJ 1995; 310 doi: (Published 27 May 1995) Cite this as: BMJ 1995;310:1409
  1. Stuart J Pocock,
  2. Marjorie Smith,
  3. Peter Baghurst
  1. Professor of medical statistics Medical Statistics Unit, London School of Hygiene and Tropical Medicine, London WC1E 7HT
  2. Deputy director Thomas Coram Research Unit, Institute of Education, London WC1H 0AA
  3. Principal research scientist Division of Human Nutrition, Commonwealth Scientific Industrial Research Organisation, Adelaide, SA 5000, Australia

    EDITOR,—We endeavoured to include all relevant epidemiological studies in our meta-analysis and believe that others expert in this field would object to Herbert L Needleman's proposed deletions. The European multicentre study was one publication with consistent methodology relating to field work in several countries. In this complex epidemiological field, methodological concerns exist for many of thestudies. In our view this is not best handled by deleting studies.

    Regrettably, we had to exclude the two studies that measured circumpulpal dentine lead. They cannot be combined with other tooth lead studies, …

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