| Level I | Good quality evidence |
Systematic review of RCTs with consistent findings High quality individual RCT |
| Level II |
Limited quality patient orientated evidence |
Systematic review of lower quality studies or studies with inconsistent findings Low quality clinical trial Cohort studies Case-control studies |
| Level III | Other |
Consensus guidelines, extrapolations from bench research, usual practice, opinion, disease-oriented evidence (intermediate or physiologic outcomes only), or case series |
[26] Haemodialysis (salicylate poisoning): McCabe DJ, Lu JJ. The association of hemodialysis and survival in intubated salicylate-poisoned patients. Am J Emerg Med. 2017 Apr 10. pii: S0735-6757(17)30280-2. https://www.ncbi.nlm.nih.gov/pubmed/28438446