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

Figure 4 Mean VAS scores at corresponding measurement points during and after colonoscopy examinations for less experienced colonoscopists (LEC group) in CO₂ and air insufflation groups. VAS scores for CO₂ insufflation were significantly better compared to air insufflation for LEC group (^dP = 0.023, ANOVA for repeated measures). ^aP < 0.05, ^bP < 0.01 vs the CO₂ group at each measurement point by Wilcoxon rank sum test.