No significant differences were observed between the NaP group ( n = 158 ) and PEG group ( n = 162 ) in bowel cleansing quality ( adequate preparation 93.0 % vs 92.6 % , P = 0.877 ) , patient compliance ( P = 0.228 ) , overall adverse events ( 63.3 % vs 69.1 % , P = 0.269 ) , or adenoma detection rate ( 34.8 % vs 35.2 % , P = 0.944 ) .