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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.
