Letter
When to stop a clinical trial.
British Medical Journal 1992; 305 doi: https://doi.org/10.1136/bmj.305.6851.475 (Published 22 August 1992) Cite this as: British Medical Journal 1992;305:475
This is a PDF-only article. The first page of the PDF of this article appears above.
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.