Letters Macrolides and infantile hypertrophic pyloric stenosis

Authors’ reply to de Vries

BMJ 2014; 349 doi: https://doi.org/10.1136/bmj.g5206 (Published 19 August 2014) Cite this as: BMJ 2014;349:g5206
  1. Marie Lund, PhD student1,
  2. Björn Pasternak, postdoctoral fellow1,
  3. Jan Wohlfahrt, chief statistician1,
  4. Mads Melbye, professor12
  1. 1Department of Epidemiology Research, National Health Surveillance and Research, Statens Serum Institut, Copenhagen, Denmark
  2. 2Department of Medicine, Stanford University School of Medicine, Stanford, USA
  1. mxd{at}ssi.dk

We thank de Vries for his valuable comments about our study.1 2 He states that the finding of an incidence rate ratio of 29.8 (95% confidence interval 16.4 to 54.1) for exposure from infant macrolide use during the first two weeks after birth is “either a very strong association or too good to be true.”

This association …

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