Letters Risk illiteracy

Rather difficult calculations

BMJ 2011; 342 doi: https://doi.org/10.1136/bmj.d2577 (Published 21 April 2011) Cite this as: BMJ 2011;342:d2577
  1. Paul J Park, general practitioner1
  1. 1Banbury Health Centre, Banbury, Oxfordshire OX16 5QD, UK
  1. pauljpark{at}hotmail.com

The screening calculation that Heath describes is rather difficult.1 I have a PhD in screening but it took me a few minutes of writing algebra on a scrap of paper to reach the answer (I …

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