Clinical Efficacy of Epidural Injections of Local Anesthetic Alone or Combined with Steroid for Neck Pain: A Systematic Review and Meta-Analysis
Table 1
Qualitative modified approach to grading of evidence.
Level
Strength of evidence
Description
I
Strong
Evidence obtained from multiple relevant high-quality randomized controlled trials
II
Moderate
Evidence obtained from at least one relevant high-quality randomized controlled trial or multiple relevant moderate- or low-quality randomized controlled trials
III
Fair
Evidence obtained from at least one relevant moderate- or low-quality randomized controlled trial with multiple relevant observational studies OR Evidence obtained from at least one relevant high-quality nonrandomized trial or observational study with multiple moderate- or low-quality observational studies
IV
Limited
Evidence obtained from multiple moderate- or low-quality relevant observational studies
V
Consensus-based
Opinion or consensus of a large group of clinicians and/or scientists