| 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] Adjunctive agents: American Society of Colon and Rectal Surgeons (ASCRS); American Society for Gastrointestinal Endoscopy (ASGE); Society of American Gastrointestinal and Endoscopic Surgeons (SAGES), Wexner SD, Beck DE, Baron TH, Fanelli RD, Hyman N, Shen B, Wasco KE. A consensus document on bowel preparation before colonoscopy: prepared by a task force from the American Society of Colon and Rectal Surgeons(ASCRS), the American Society for Gastrointestinal Endoscopy (ASGE), and the Society of American Gastrointestinal and Endoscopic Surgeons (SAGES). SurgEndosc. 2006 Jul;20(7):1147-60. http://www.ncbi.nlm.nih.gov/pubmed/16763922
Adjunctive agents: Rhodes JB, Engstrom J, Stone KE. Metoclopramide reduces the distress associated with colon cleansing by an oral electrolyte overload. GastrointestEndosc 1978;24:162-3.http://www.ncbi.nlm.nih.gov/pubmed/348558
Adjunctive agents: Brady CE III, DiPalma JA, Pierson WP. Golytely lavage: is metoclopramide necessary? Am J Gastroenterol 1985;80:180-4.http://www.ncbi.nlm.nih.gov/pubmed/3976636
Adjunctive agents: Brady CE 3rd, DiPalma JA, Beck DE. Effect of bisacodyl on gut lavage cleansing for colonoscopy. Am Clin Res 1987;19:34-8. http://www.ncbi.nlm.nih.gov/pubmed/3555277