Table 2 Quality of evidence
Quality of evidence | Definition |
|---|---|
A | Consistent level 1 studies |
B | Consistent level 2 or 3 studies or extrapolations from level 1 studies |
C | Level 4 studies or extrapolations of level 2 or 3 studies |
D | Level 5 evidence or studies of any level with inconsistency or inconclusiveness |