Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
| Blood clot | No blood clot | Risk | |
|---|---|---|---|
| Treatment | 70 | 430 | 70/500 = 14% |
| Placebo | 150 | 350 | 150/500 = 30% |
ARR = 30–14% = 16% (16% lower incidence of developing one blood clot in the treatment compared with the placebo group).
NNT = 1/0.16 = 6.25 (about six patients will need to be treated to prevent one blood clot).
