Asthma trends

BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6979.599b (Published 04 March 1995) Cite this as: BMJ 1995;310:599
  1. Jennifer K Peat,
  2. Cheryl M Salome,
  3. Ann J Woolcock
  1. Senior research fellow Senior research officer Professor of respiratory medicine Department of Medicine, University of Sydney, NSW 2006, Australia

    EDITOR,—Helen Booth and colleagues suggest that differences in the output of DeVilbiss No 40 and No 45 nebulisers1 may have influenced our estimates of the increase in the prevalence of airway hyperresponsiveness in children studied 10 years apart, in 1982 and 1992.2 We expressed airway responsiveness both as a dose-response ratio (defined as the percentage fall in forced expiratory volume in one second divided …

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