The Argentina Brief Colonoscopy Difficulty Score (ABCD)

All participants will undergo to colonoscopy examination performed by competent/junior or expert/senior endoscopists (\>150-400 or \>400 previous colonoscopies, respectively). Bowel preparation was performed using different solutions, according to the clinical discretion of the attending, who indicated colonoscopy. After deep sedation by intravenous propofol with or without fentanyl or midazolam administration, a water-assisted colonoscopy was performed using a high-definition (HD) scope with white light (WL). Colonoscope trademark differs among participant centres.