| 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 |
[1] Azithromycin, oral: Wasserman S, Boyles T, Mendelson M. South African antibiotic stewardship programme (SAASP): A pocket guide to antibiotic prescribing for adults in South Africa, 2015. http://www.fidssa.co.za/images/SAASP_Antibiotic_Gudidelines_2015.pdf