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Table 3 Level of Evidence according to the Classification schemes

From: Post-stroke care after medical rehabilitation in Germany: a systematic literature review of the current provision of stroke patients

Level of Evidence:
Ia Evidence for meta-analysis of randomized controlled trials
Ib Evidence from at least one randomized controlled trial
IIa Evidence from at least one controlled study without randomization
IIb Evidence from at least one other type of quasi-experimental study
III Evidence from non-experimental descriptive studies, such as comparative studies, correlation studies, and case-control studies
IV Evidence from expert committee reports or opinions or clinical experience of respected authorities, or both