Endgames Statistical question

Number needed to treat

BMJ 2009; 338 doi: http://dx.doi.org/10.1136/bmj.b2493 (Published 24 June 2009) Cite this as: BMJ 2009;338:b2493
  1. John Fletcher, clinical epidemiologist
  1. 1BMJ, London WC1H 9JR
  1. jfletcher{at}bmj.com

    Two weeks after entry to a trial of antibiotics to treat symptoms of chest infection, 25% of people receiving placebo and 15% of people receiving antibiotics still had symptoms. What is the number needed to treat in this trial for antibiotics to cure symptoms at two weeks?

    • a) 10

    • b) 1.18

    • c) 10%

    • d) 4

    • e) 6.7


    a—Number needed to …

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