Both the adenoma detection rate and the detection rate of advanced adenomas were not significantly different between the two groups ( respectively , 52.1 % vs. 55 % , RR = 0.95 , 95 % CI 0.75-1 .20 ; 32.5 % vs. 44.2 % , RR = 0.74 , 95 % CI 0.53-1 .02 ) .