The CO2 group showed a superiority of intubation in the ITT analysis ( oral route : 323.864.2 vs 238.368.6 cm ; anal route : 261.674.2 vs 174.762.1 cm , both p < 0.001 ) , and the total enteroscopy rate ( 34.9 % vs 17.6 % , p = 0.006 ) .