| Grade . | Strength of evidence . |
|---|---|
| A | Directly based on level 1 evidence |
| B | Directly based on level 2 evidence or extrapolated recommendation from level 1 evidence |
| C | Directly based on level 3 evidence or extrapolated recommendation from either level 1 or level 2 evidence |
| D | Directly based on level 4 evidence or extrapolated recommendation from either level 1, 2 or 3 evidence |
| GPP | Good practice point based upon the views of the Guideline Development Group |
| Grade . | Strength of evidence . |
|---|---|
| A | Directly based on level 1 evidence |
| B | Directly based on level 2 evidence or extrapolated recommendation from level 1 evidence |
| C | Directly based on level 3 evidence or extrapolated recommendation from either level 1 or level 2 evidence |
| D | Directly based on level 4 evidence or extrapolated recommendation from either level 1, 2 or 3 evidence |
| GPP | Good practice point based upon the views of the Guideline Development Group |
| Grade . | Strength of evidence . |
|---|---|
| A | Directly based on level 1 evidence |
| B | Directly based on level 2 evidence or extrapolated recommendation from level 1 evidence |
| C | Directly based on level 3 evidence or extrapolated recommendation from either level 1 or level 2 evidence |
| D | Directly based on level 4 evidence or extrapolated recommendation from either level 1, 2 or 3 evidence |
| GPP | Good practice point based upon the views of the Guideline Development Group |
| Grade . | Strength of evidence . |
|---|---|
| A | Directly based on level 1 evidence |
| B | Directly based on level 2 evidence or extrapolated recommendation from level 1 evidence |
| C | Directly based on level 3 evidence or extrapolated recommendation from either level 1 or level 2 evidence |
| D | Directly based on level 4 evidence or extrapolated recommendation from either level 1, 2 or 3 evidence |
| GPP | Good practice point based upon the views of the Guideline Development Group |
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