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Table 1 Showing statements of evidence

From: The conundrum of guidelines, recommendations, and strength of recommendation

Statements of evidence
IaEvidence obtained from meta-analysis of RCTs
IbEvidence obtained from at least 1 RCT
IIaEvidence obtained from at least 1 well-designed controlled study without randomization
IIbEvidence obtained from at least 1 other type of well-designed quasi-experimental study
IIIEvidence obtained from well-designed non-experimental descriptive studies, such as comparative studies, correlation studies, and case reports
IVEvidence obtained from expert committee reports or opinions and/or clinical experiences of respected authorities