| 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 |
[22] Paracetamol overdosing – repeated subtherapeutic ingestion: Chiew AL, Fountain JS, Graudins A, Isbister GK, Reith D, Buckley NA. Summary statement: new guidelines for the management of paracetamol poisoning in
Australia and New Zealand. Med J Aust. 2015 Sep 7;203(5):215-8. Erratum in: Med J Aust. 2015 Oct 19;203(8):320. Med J Aust. 2016 Aug 15;205(4):167. https://www.ncbi.nlm.nih.gov/pubmed/26852051