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.
Effect sizes (gbtw or gwin; filled and open circles, respectively) and 95% confidence intervals for manipulations in the Clinical category. Only studies for which effect sizes could be calculated are included. Larger effect sizes reflect greater preference for larger, delayed outcomes.
