| 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 |
[25] Dexamethasone, IM: Brownfoot FC, Gagliardi DI, Bain E, Middleton P, Crowther CA. Different corticosteroids and regimens for accelerating fetal lung maturation for women at risk of preterm birth. Cochrane Database Syst Rev. 2013 Aug 29;8:CD006764. http://www.ncbi.nlm.nih.gov/pubmed/123990333
Dexamethasone, IM: Royal College of Obstetricians and Gynaecologists. Green-top Guideline No.7: Antenatal corticosteroids to reduce neonatal morbidity and mortality. October 2010. Available at: https://www.rcog.org.uk/globalassets/documents/guidelines/gtg_7.pdf