1 out of 3 stars = Level III (lowest level of evidence)
The level of evidence and strength of recommendation for each treatment according to North American guidelines have been rated with stars.
Level of evidence
1 out of 3 stars = Level III (lowest level of evidence)
2 out of 3 stars = Level II (moderate level of evidence)
3 out of 3 stars = Level I (strongest level of evidence)
Strength of recommendation
1 out of 3 stars = “C” rating (lowest strength of recommendation)
2 out of 3 stars = “B” rating (moderate strength of recommendation)
3 out of 3 stars = “A” rating (highest strength of recommendation)