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Prevalence of venous thromboembolism in medical inpatients

J Alasdair Millar, Glenda E Lee and Rinaldo Ienco
Med J Aust 2010; 192 (12): 724-726.
Published online: 21 June 2010

To the Editor: The clinical justification for a medical intervention depends on absolute prevalence (p) of a disease or condition in a population and the relative risk reduction (R) that would result from the intervention. These variables determine the “number needed to treat” (NNT) to prevent one occurrence of a disease, according to the formula NNT = [100 ÷ (P × R)], where P and R are expressed as percentages.

  • J Alasdair Millar1
  • Glenda E Lee2
  • Rinaldo Ienco3

  • 1 Medicine Department, Southland Hospital, Invercargill, New Zealand.
  • 2 Drug Usage and Assessment Group, Royal Perth Hospital, Perth, WA.
  • 3 Finance and Business Services, Royal Perth Hospital, Perth, WA.


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