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Table 1 Grading standard for the evidence evaluation and recommendations in the current consensus [1,2,3,4]

From: Expert consensus on the evaluation and diagnosis of combat injuries of the Chinese People’s Liberation Army

Grading Grading standard
Grading for evidence Evaluation Grading standard for evidence evaluation
 Grade A Randomized controlled clinical trials or meta-analyses based on such trials using proper methods.
 Grade B Randomized controlled clinical trials, partially randomized controlled clinical trials, or meta-analyses based on such trials using methods with some insufficiencies.
 Grade C Retrospective case studies or meta-analyses based on such studies.
 Grade D Non-controlled studies (such as case reports), expert opinions, or evidence from basic medical research.
Grading for recommendations Grading standard for recommendations
 Type I A medical measure is proven and/or commonly agreed upon to be beneficial, useful, and effective.
 Type II The effectiveness of a medical measure is still controversial.
  IIa The evidence and/or perspective tends to be useful and effective.
  IIb The evidence and/or perspective has not been proven useful and effective.
 Type III A medical measure is proven and/or commonly agreed upon to be ineffective, may be harmful in some cases, and hence is not recommended.