Grade | Study type |
---|---|
1 (high) | Systematic literature review targeting RCTs (systematic review with/without meta-analysis) |
2 | Randomized controlled trial, systematic literature review targeting category 3 |
3 | Quasi-RCT, cohort study, case-control study, observational/analytic study |
4 (low) | Cross-sectional study, case series, before/after study, case report, non-analytic study |