- Level of Evidence
- Grades of Recommendation
Level of Evidence
| Level | Description |
|---|---|
| 1 | High-quality prospective randomized clinical trial |
| 2 | Prospective comparative study |
| 3 | Retrospective case control study |
| 4 | Case Series |
| 5 | Expert Opinion |
Grades of Recommendation
| Grade | Description |
|---|---|
| A | Treatment options are supported by strong evidence (consistent with Level I or II studies) |
| B | Treatment options are supported by fair evidence (consistent with Level III or IV studies) |
| C | Treatment options are supported by either conflicting or poor quality evidence (Level IV studies) |
| I | When insufficient evidence exists to make a recommendation |