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Table 2 Levels of evidence

From: Transthoracic Echocardiographic Assessment of the Heart in Pregnancy—a position statement on behalf of the British Society of Echocardiography and the United Kingdom Maternal Cardiology Society

Level of evidence A

Data derived from multiple randomised clinical trials or meta-analyses

Level of evidence B

Data derived from a single randomised clinical trial or large non-randomised studies

Level of evidence C

Consenus of opinion of the experts and/or small studies, retrospective studies, registries

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Echo Research & Practice

ISSN: 2055-0464

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