Table 1.
Categorization of total scores of the Downs and Black Checklist [12]
| Quality index | Percentage | Methodological quality score (n = 27) |
|---|---|---|
| Strong | ≥ 75% | ≥ 21 |
| Moderate | 50–74% | 14–20 |
| Limited | 25–49% | 7–13 |
| Poor | < 25% | < 7 |
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.