Prevalence of venous thromboembolism in medical inpatients

J Alasdair Millar, Glenda E Lee and Rinaldo Ienco
Med J Aust 2010; 192 (12): . || doi: 10.5694/j.1326-5377.2010.tb03720.x
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.


remove_circle_outline Delete Author
add_circle_outline Add Author

Do you have any competing interests to declare? *

I/we agree to assign copyright to the Medical Journal of Australia and agree to the Conditions of publication *
I/we agree to the Terms of use of the Medical Journal of Australia *
Email me when people comment on this article

Online responses are no longer available. Please refer to our instructions for authors page for more information.