Table 2.
Assigned weights for research study year of publication.
| Year of publication | Rank |
| Previous 1-5 years | 1 |
| Previous 6-10 years | 2 |
| Previous 11-15 years | 3 |
| Other | 4 |
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.