ESO
Definitions for levels of recommendation
| Level A | Established as useful/predictive or not useful/predictive for a diagnostic measure or established as effective, ineffective or harmful for a therapeutic intervention; requires at least one convincing Class I study or at least two consistent, convincing Class II studies. |
| Level B | Established as useful/predictive or not useful/predictive for a diagnostic measure or established as effective, ineffective or harmful for a therapeutic intervention; requires at least one convincing Class II study or overwhelming Class III evidence |
| Level C | Established as useful/predictive or not useful/predictive for a diagnostic measure or established as effective, ineffective or harmful for a therapeutic intervention; requires at least two Class III studies. |
| Good Clinical Practice (GCP) points | Recommended best practice based on the experience of the guideline development group. Usually based on Class IV evidence indicating large clinical uncertainty, such GCP points can be useful for health workers |
References
The European Stroke Organisation (ESO) www.eso-stroke.org
Guidelines for Management of Ischaemic Stroke 2008. The European Stroke Organisation (ESO) Executive Committee and the ESO Writing Committee Cerebrovasc Dis 2008;25:457–507. Download pdf here.
