CO2 insufflation for potentially difficult colonoscopies: Efficacy when used by less experienced colonoscopists

Figure 2 Mean VAS scores at corresponding measurement points during and after colonoscopy examinations in CO₂ and air insufflation groups. VAS scores for CO₂ insufflation were significantly better than those for air insufflation (^dP < 0.001, ANOVA for repeated measures). ^aP < 0.05, ^bP < 0.01 vs the CO₂ group at each measurement point by Wilcoxon rank sum test. VAS: Visual analogue scale.