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Table 2 Assessment of the quality of the evidence by USPSTF [8]

From: Supporting recommendations for childhood preventive interventions for primary health care: elaboration of evidence synthesis and lessons learnt

Grade Definition
Good Evidence includes consistent results from well-designed, well-conducted studies in representative populations that directly assess effects on health outcomes.
Fair Evidence is sufficient to determine effects on health outcomes, but the strength of the evidence is limited by the number, quality, or consistency of the individual studies, generalizability to routine practice, or indirect nature of the evidence on health outcomes.
Poor Evidence is insufficient to assess the effects on health outcomes because of limited number or power of studies, important flaws in their design or conduct, gaps in the chain of evidence, or lack of information on important health outcomes.