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  1. Michael S Kramer, professor
  1. McGill University Faculty of Medicine, Montreal, Quebec, Canada H3H 1P3
  1. michael.kramer{at}mcgill.ca

    Silvers et al say that our recent paper was written as if the study's main aim was to test the association between prolonged exclusive breast feeding and asthma and allergy.1 Every randomised controlled trial has a primary outcome that serves as the basis for estimating sample size requirements and for obtaining funding. But we also examined secondary outcomes in the first year of life and sought support …

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