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.
| Study | One or two daily doses (n/N) | Three daily doses (n/N) | Risk ratio | 95% CI |
| Principi 1986 | 49/55 | 51/55 | 0.96 | 0.85 to 1.08 |
| Murph 1993 | 27/33 | 23/34 | 1.21 | 0.91 to 1.60 |
| Hoberman 1997 | 241/287 | 229/288 | 1.06 | 0.98 to 1.14 |
| Behre 1997 | 212/231 | 210/232 | 1.01 | 0.96 to 1.07 |
| Damrikarnlert 2000 | 187/199 | 175/187 | 1.00 | 0.95 to 1.06 |
CI: confidence interval
