| 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 |
[32] Calcium gluconate 10%, infusion (serum calcium <2 mmol/L): Tohme JF, Bilezikian JP. Diagnosis and treatment of hypocalcaemic emergencies. The Endocrinologist. 1996; 10-18. http://journals.lww.com/theendocrinologist/Abstract/1996/01000/Diagnosis_and_Treatment_of_Hypocalcemic.3.aspx