Fixed Low-dose Simethicone Combined With Macrogol 4000 (PEG) Reduces Colon Bubble Formation in Colonoscopy

Inclusion Criteria: patients : * scheduled for colonoscopy as part of CRC screening, using the bowel preparation with fixed low-dose of simethicone combined with Macrogol 4000 (PEG) * aged 50-75 years, * with no family history of CRC or personal history of colon polyps but with a positive Faecal Immunochemical Test (FIT), with a family history of CRC or personal history of colon polyps, * requiring surveillance colonoscopy after 5 years if diagnosed with one or two tubular adenomas \<10 mm in diameter (low-risk group) or after 3 years if diagnosed with at least 3 adenomas or any adenoma at least 10 mm in diameter or with high-grade dysplasia, according to French recommendations during the study inclusion period. Exclusion Criteria: \-