Figure 1.

Percentages of correct answers (yes/no choice; correct answer was yes in all cases) to the following questions. ^aCO₂ insufflation is not advised in patients with severe pulmonary diseases; ^bAbout 20% of patients still have pain 6 h after colonoscopy using air insufflation; ^cAbout 20% of patients need ≥ 2 d before they are able to return to their normal activities after screening colonoscopy; ^dCompared to air, CO₂ colonoscopy decreases the risk of bowel explosion; ^eCompared to air, CO₂ insufflation is better for ERCP and double balloon enteroscopy DBE.