Table 2.
Power calculations
| Control | Intervention | Difference | N (including compensation for 20% attrition) |
|---|---|---|---|
| 0.8 | 0.4 | 0.4 | 70 (88) |
| 0.8 | 0.5 | 0.3 | 116 (145) |
| 0.8 | 0.6 | 0.2 | 238 (298) |
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.