Table 1 |
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ILCOR levels of evidence for therapeutic interventions |
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LOE 1 |
Randomized controlled trials (RCTs) or meta-analyses of RCTs |
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LOE 2 |
Studies using concurrent controls without true randomization or meta-analyses of such studies |
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LOE 3 |
Studies using retrospective controls |
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LOE 4 |
Studies without a control group (for example, cases series) |
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LOE 5 |
Studies not directly related to the speciļ¬c population (for example, different patients, animal models, mechanical models, and so on) |
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Scolletta et al. Critical Care 2012 16:R41 doi:10.1186/cc11235 |
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