Letters

Twins and asthma

BMJ 2001; 322 doi: https://doi.org/10.1136/bmj.322.7285.556 (Published 03 March 2001) Cite this as: BMJ 2001;322:556

Difference in admission rates may be due to other factors

  1. Elisa Huovinen (elisa.huovinen@helsinki.fi), researcher,
  2. Jaakko Kaprio (jaakko.kaprio@helsinki.fi), professor of public health
  1. Department of Public Health, University of Helsinki, FIN-00014 Helsinki, Finland
  2. Department of Public Health and General Practice, University of Oulu, FIN-90014 Helsinki, Finland
  3. Department of Public Health Sciences, St George's Hospital Medical School, London SW17 0RE

    EDITOR—Strachan et al found an interesting difference between admissions to hospital for childhood asthma between twins and singletons.1 They conclude that there is reduced risk of asthma among twins. We found no significant difference in questionnaire based asthma diagnoses between singletons and twins aged 30–59 years among the Finnish twin cohort, but we did not give figures.2 The Finnish twin cohort is a population based sample of adult twin pairs of the same sex selected from the central population registry of Finland as pairs of individuals with the same birth date and sex, as well as the same surname and local community …

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