Childhood vaccination should have been included in asthma study

doi:10.1136/bmj.317.7152.205

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Robert Blomfield, Retired homoeopathic general practitioner

Hebden Bridge, West Yorkshire

EDITOR–Kaur et al's finding that children aged 12-14 years in cities had less asthma (30.3%) than those in rural areas (35%)1 must lead to questions about the role of air pollution in asthma.

What I found disappointing was the absence in the questionnaire of …