Table 2.

Colonoscopy preparation schedules

PEG + Asc	2 L from 6:00 to 8:00 PM (250 mL every 15 min) plus 500 mL of clear fluid for every L of solution, evening before colonoscopy
	Each liter of PEG + Asc (MoviPrep®) contains 100 g macrogol 3350, 7.5 g sodium sulfate, 2.7 g sodium chloride, 1 g potassium chloride, 4.7 g ascorbic acid, 5.9 g sodium ascorbate, and lemon flavoring
PEG + Sim	2 L from 3:00 to 5:00 PM and 2 L from 6:00 to 8:00 PM (250 mL every 15 min), evening before colonoscopy
	Each liter of PEG + Sim (Selg®-Esse 1000) contains 58.3 g macrogol 4000, 0.08 g simethicone, 5.68 g sodium sulfate, 1.68 g sodium bicarbonate, 1.46 g sodium chloride and 0.74 g potassium chloride and mandarin aroma

A low-fiber diet (mainly the avoidance of fruits and vegetables) was recommended for three days before the endoscopy to all subjects and, the day before, they were advised to have regular breakfast, a light lunch and only clear liquids for dinner. PEG + Asc: Polyethylene glycol plus ascorbic acid; PEG + Sim: Polyethylene glycol plus simethicone.