| 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 |
[66] Prednisone: Vazquez VA, Sotelo J. The course of seizures after treatment for cerebral cysticercosis.N Engl J Med. 1992;327:696-701. http://www.ncbi.nlm.nih.gov/pubmed/1495522