4-L SF-PEG resulted in better Ottawa scores compared to 2-L PEG + Asc , 4.2 vs 4.9 ( P = 0.0186 ) ; left colon : 1.33 vs 1.57 respectively ( P = 0.0224 ) , right colon : 1.38 vs 1.63 respectively ( P = 0.0097 ) .