Efficacy of 0.5-L vs 1-L polyethylene glycol containing ascorbic acid as additional colon cleansing methods for inadequate bowel preparation as expected by last stool examination before colonoscopy

Table 1 Aronchick bowel preparation scale

Grade	Point(s)	Description
Excellent	1	Small amount of clear liquid with clear mucosa seen; more than 95% of mucosa seen
Good	2	Small amount of turbid fluid without feces not interfering with examination; more than 90% of mucosa seen
Fair	3	Moderate amount of stool that can be cleared with suctioning permitting adequate evaluation of entire colonic mucosa; more than 90% of mucosa seen
Poor	4	Inadequate but examination completed; enough feces or turbid fluid to prevent a reliable examination; less than 90% of mucosa seen
Inadequate	5	Re-preparation required; large amount of fecal residue precludes a complete examination