Table 1.

Definitions of the levels of Estimate of Certainty (Precision) of Treatment Effect. 2013 ACCF/AHA STEMI Guidelines [3]

Level A: Multiple populations evaluated. Data derived from multiple randomized clinical trials or meta-analyses.

Level B: Limited populations evaluated. Data derived from a single randomized trial or nonrandomized studies.

Level C: Very limited populations evaluated. Only consensus opinion of experts, case studies, or standard of care.

Definitions of the Levels of Evidence. 2017 ESC STEMI Guidelines [4]

Level A: Data derived from multiple randomized clinical trials or meta-analyses.

Level B: Data derived from a single randomized clinical trial or large nonrandomized studies.

Level C: Consensus of opinion of experts and/or small studies, retrospective studies, registries.