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Table 1 International Liaison Committee on Resuscitation (ILCOR) 2010 Levels of Evidence for Studies of Therapeutic Interventions

From: Mechanical CPR devices compared to manual CPR during out-of-hospital cardiac arrest and ambulance transport: a systematic review

LOE 1: Randomized Controlled Trials (or meta-analyses of RCTs)
LOE 2: Studies using concurrent controls without true randomization (e.g. “pseudo”-randomized)
LOE 3: Studies using retrospective controls
LOE 4: Studies without a control group (e.g. case series)
LOE 5: Studies not directly related to the specific patient/population (e.g. Different patient/population, animal models, mechanical models etc.)