| 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 |
[20] TOP option (MVA or medical TOP): Blanchard K, Lince-Deroche N, Fetters T, Devjee J, de Menezes ID, Trueman K, Sudhinaraset M, Nkonko E, Moodley J. Introducing medication abortion into public sector facilities in KwaZulu-Natal, South Africa: an operations research study. Contraception. 2015 Oct;92(4):330-8. http://www.ncbi.nlm.nih.gov/pubmed/26162575