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 | Interval | group | sample n | mean | SD |
| Drummond 1990 | 6 months | Consultation liaison | 18 | 4.6 | 4.7 |
| Control | 19 | 5.4 | 7.0 | ||
| Katon 1999 | 1 month | Consultation liaison | 114 | 1.35 | 1.6 |
| Control | 114 | 1.5 | 1.5 | ||
| 3 months | Consultation liaison | 114 | 1.05 | 1.6 | |
| Control | 114 | 1.35 | 1.5 | ||
| 6 weeks | Consultation liaison | 114 | 1.15 | 1.6 | |
| Control | 114 | 1.3 | 1.4 |
