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Letters Calcium supplementation

Confounders were ignored

BMJ 2008; 336 doi: (Published 21 February 2008) Cite this as: BMJ 2008;336:403
  1. Luca Puccetti, president
  1. 1Promed Galileo Medical Society, Pisa 56011, Italy
  1. lucpucce{at}

Bolland et al did not control for vitamin D concentrations during their study but said only that the women with serum 25-hydroxyvitamin D concentrations below 25 nmol/l were excluded.1 This implies that serum concentrations of …

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