Skip to main content

Table 2 Grading of the conclusions and recommendations according to the level of evidence and strength of recommendation

From: Bologna guidelines for diagnosis and management of adhesive small bowel obstruction (ASBO): 2017 update of the evidence-based guidelines from the world society of emergency surgery ASBO working group

Level

Conclusion based on

 A

Systematic review (A1) or at least 2 independent studies with evidence level A2 (“there is evidence that…”)

 B

One study with evidence level A2 or at least 2 independent studies with evidence level B (“it is likely that…”)

 C

One study with evidence level B or level C (“there are indications that…”)

 D

Expert opinion (“the working group recommends…”)

Level

Recommendation

 I

Strong recommendation

 II

Weak recommendation (suggestion)