| 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 |
[34] Sodium citrate, solution: Paranjothy S, Griffiths JD, Broughton HK, Gyte GM, Brown HC, Thomas J. Interventions at caesarean section for reducing the risk of aspiration pneumonitis. Cochrane Database Syst Rev. 2014 Feb 5;2:CD004943. http://www.ncbi.nlm.nih.gov/pubmed/24497372
Sodium citrate solution: National Department of Health, Essential Drugs Programme. Medicine review: Sodium citrate solution to reduce the risk of aspiration pneumonitis in patients undergoing Caeserean section. September 2015. http://health.gov.za/