| 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 |
[3] Vaginal discharge syndrome – Sexual activity criterion: Kularatne R, Radebe F, Kufa-Chakezha T, Mbulawa Z, Lewis D. Sentinel Surveillance of Sexually Transmitted Infection Syndrome aetiologies and HPV genotypes among patients attending Primary Health Care Facilities in South Africa, April 2014 – September 2015. http://www.nicd.ac.za/wp-content/uploads/2017/03/3Final-25-April-2017_Revised-NAS_v5_NICD.pdf
Vaginal discharge syndrome – speculum examination: National Department of Health. Comprehensive STI Clinical Management Guidelines, draft version.