The timing of bowel preparation before colonoscopy determines the quality of cleansing, and is a significant factor contributing to the detection of flat lesions: A randomized study

Table 2 Comparison of rate of patients with cleansing quality ≥ 4, between different treatment groups (mean ± SD, %)

Group	Global	Cecum	Ascending	Transverse	Descending-sigmoid	Rectum
1	78.6 ± 0.2	72.1 ± 0.2	79.1 ± 0.2	81.0 ± 0.1	76.7 ± 0.2	79.1 ± 0.2
2	80.0 ± 0.2	84.4 ± 0.1	77.8 ± 0.2	82.2 ± 0.1	86.7 ± 0.1	86.7 ± 0.1
3	26.7 ± 0.2b	38.6 ± 0.2b	22.2 ± 0.2b	35.6 ± 0.2b	60.0 ± 0.2d	57.8 ± 0.2d
4	6.8 ± 0.1 b	14.6 ± 0.1b	9.8 ± 0.1b	32.6 ± 0.2b	45.5 ± 0.2b	50.0 ± 0.2b

^bP < 0.01 vs Group 1, 2. (Bonferroni´s correction);

^dP < 0.01 vs Group 2.