Taking folate in pregnancy and risk of maternal breast cancer

doi:10.1136/bmj.330.7491.600-a

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What's in a name?

J Martin Bland, professor of health statistics (mb55@york.ac.uk)

University of York, York YO10 5DD

EDITOR—In their interesting follow up of an old trial, Charles et al tell us that this randomised trial was of high quality and that the trial was double blind.1 They also tell us that tablets were supplied in six colours, two of which contained folate in 0.2 mg and 5 mg daily doses. The tablets were kept in numbered drawers and distributed in sequence.

If the tablets had different colours for different treatments the trial …