| 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] Ceftriaxone, IM: National Department of Health, Essential Drugs Programme: Primary Health Care STGs and EML, 2018. http://www.health.gov.za/
Ceftriaxone, IM: Newman LM, Moran JS, Workowski KA. Update on the management of gonorrhea in adults in the United States. Clin Infect Dis. 2007 Apr 1;44Suppl 3:S84-101.Review. http://www.ncbi.nlm.nih.gov/pubmed/17342672
Ceftriaxone, IM: Workowski KA, Berman S; Centers for Disease Control and Prevention (CDC). Sexually transmitted diseasestreatment guidelines, 2010.MMWR Recomm Rep. 2010 Dec 17;59(RR-12):1-110. Erratum in: MMWR Recomm Rep. 2011 Jan14;60(1):18. Dosage error in article text. http://www.cdc.gov/std/treatment/2010/