Letters

Several factors were not considered in study of increase in hay fever and eczema

BMJ 1998; 316 doi: https://doi.org/10.1136/bmj.316.7132.707a (Published 28 February 1998) Cite this as: BMJ 1998;316:707
  1. Verity McClelland,
  2. Emily Watson,
  3. Maria Safar, 4th year medical students
  1. Department of Epidemiology and Public Health, School of Health Sciences, Medical School, University of Newcastle, Newcastle upon Tyne NE2 4HH

    EDITOR—Butland et al show that the observed doubling in the prevalence of hay fever and eczema in cohorts of British adolescents between 1974 and 1986 cannot be accounted for purely by differences between the cohorts in terms of sex, birth weight, birth order, maternal age, breast feeding, maternal smoking in pregnancy, or father's social class.1 While these results are important, several factors were not considered in the analysis.

    Firstly, an increase in public awareness of atopic diseases …

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