| 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 |
[17] Phenobarbital, oral via naso-gastric tube (children-status epilepticus): Wilmshurst JM, van der Walt JS, Ackermann S, Karlsson MO, Blockman M. Rescue therapy with high-dose oral phenobarbitone loading for refractory status epilepticus. J Paediatr Child Health. 2010 Jan;46(1-2):17-22. https://www.ncbi.nlm.nih.gov/pubmed/19943867