Table 2 Status of the evidence levels of domestic and international studies
Grade | Study type | Result (literature) | |
|---|---|---|---|
Domestic | International | ||
1 | Systematic literature review targeting RCTs (systematic review with/without meta-analysis) | 0 | 0 |
2 | RCT | 0 | 0 |
Systematic literature review targeting category 3 | 0 | 5 | |
3 | Quasi-RCT | 0 | 0 |
Cohort study | 3 | 4 | |
Case-control study | 0 | 3 | |
Observational, analytic study | 0 | 0 | |
4 | Cross-sectional study | 0 | 0 |
Case series | 0 | 1 | |
Case report | 6 | 6 | |
Non-analytic study | 0 | 0 | |