Level of evidence Strength of recommendation Strength of recommendation Total
Class 1 (strong) Class 2 (weak and conditional)
High 3 (5.5) 1 (1.8) 4 (7.3)
Moderate 2 (3.6) 4 (7.3) 6 (10.9)
Low 4 (7.3) 3 (5.5) 7 (12.7)
Very low 6 (10.9) 32 (58.2) 38 (69.1)
Total 15 (27.3) 40 (72.7) 55 (100)