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Authors’ response:
  1. Arthur Marx, MD MPH,
  2. Heiner Bucher, MD MPH

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    Dear Dr Peterson:

    Your observation is correct and implicitly concurs with our example, but we failed to correctly state when to divide by factor f and when to multiply. In paragraph #6 we wrote: “... the baseline risk of included trials ranged from 2% to 22%...the corresponding NNT for an average follow-up of 18 …

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