A Narrative Review of Lumbar Fusion Surgery With Relevance to Chiropractic Practice

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Published online 2016 Oct 18. doi: 10.1016/j.jcm.2016.08.007

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Table 1

Level of Evidence Recommendation Grades^a

Grade	Definition
A	Good evidence: 2 or more Level I studies with consistent findings
B	Fair evidence: single Level I study or multiple Level II or III studies with consistent findings
C	Poor evidence: single Level II study of multiple Level IV or V studies.
I	Insufficient evidence for recommendation: single level III, IV, or V study; studies of equivalent strength with conflicting findings/conclusions

^aData from Kaiser et al.¹³