Table 4. Grading of evidence

___________________________________________________________________________________________________
                   | Strength of evidence = A | Strength of evidence = B | Strength of evidence = C
___________________|__________________________|__________________________|_________________________
Primary evidence   | Randomized controlled    | Well designed clinical   | Panel consensus
                   | trials                   | studies                  |
___________________|__________________________|__________________________|_________________________
Secondary evidence | Other clinical studies   | Clinical studies related | Clinical studies related
                   |                          | to topic but not in an   | to topic but not in an
                   |                          | unstable angina          | unstable angina
                   |                          | population               | population
___________________|__________________________|__________________________|_________________________