Study Design: Randomized, controlled trial; Level of evidence, 1.

研究设计：随机对照研究； 循证医学级别，1级。

youdao

Conventional methods identified the level of evidence available for each of the blood conservation interventions.

并应用常规方法辨识每种血液保护干预方法的可信度。

youdao

Level of evidence: Prognostic level II. See Instructions to Authors for a complete description of levels of evidence.

证据等级：预后II级。见作者须知中有关证据等级的具体说明。

youdao

In medicine, your baseline need has to be for a level of evidence that can lead to your conclusions.

NEWYORKER: The Operator

"The level of evidence required for this taxpayer-funded scheme is high, which is right and proper, " a spokesman said.

BBC: HS2 compensation: Government spends ?43m on 72 properties

It rarely reaches the level of evidence required in a court of law to prove matters beyond a reasonable doubt.

CNN: Obama's Iran problem and the Bush doctrine