| 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 |
[12] Glycopyrrolate: Kongsgrud F, Sponheim S. A Comparison of Atropine and Glycopyrrolate in Anaesthetics Practice. Acta Anaesth Scand. 1982. 25 (5): 620-625. AND Salem MG, Richardson JC, Meadows GA, Lampluch G, Lai KM. Comparison between glycopyrrolate and atropine in a mixture with neostigmine for reversal of neuromuscular blockage: Studies in patients following open heart surgery. BJA. 1985, 57(2): 184-187.