Letters
Warfarin and atrial fibrillation
Problems with using numbers needed to harm
BMJ 2015; 350 doi: https://doi.org/10.1136/bmj.h1581 (Published 24 March 2015) Cite this as: BMJ 2015;350:h1581
- Benjamin D Williams, PhD student1
- 1University of Manchester, Manchester M13 9PL, UK
- benjamin.williams-4{at}postgrad.manchester.ac.uk
I have some questions about Jun and colleagues’ use of number needed to harm in their research article on the association between kidney function and major bleeding in older adults with atrial fibrillation starting warfarin treatment.1
In the methods they wrote: “Based on the adjusted incidence rates of major bleeding in chronic kidney disease (defined as <60 mL/min/1.73 m2) and …
Log in
Log in using your username and password
Log in through your institution
Subscribe from £173 *
Subscribe and get access to all BMJ articles, and much more.
* For online subscription
Access this article for 1 day for:
£38 / $45 / €42 (excludes VAT)
You can download a PDF version for your personal record.