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.
Quality evaluation of randomized controlled clinical trials
| Study | Study type | Randomization (2) | Concealment of allocation (2) | Double blinding (2) | Withdrawals and dropouts (1) | Quality evaluation |
|---|---|---|---|---|---|---|
| Chen et al. [5] (2018) | RCT | 2 | 2 | 2 | 1 | High quality |
| Gibson et al. [11] (2017) | RCT | 2 | 2 | 1 | 1 | High quality |
| Qu et al. [25] (2017) | RCT | 2 | 1 | 0 | 1 | High quality |
| Mayer and Brock [21] (1993) | RCT | 2 | 1 | 0 | 1 | High quality |
RCT : randomized controlled clinical trial
