Table 2.

Outcome of bowel preparation

	3 L split-dose group (n = 345)	2 L group (n = 350)	P value*
Adequate bowel preparation, n (%)
Left colon	319 (92.5)	313 (89.4)	0.163
Transverse colon	335 (97.1)	330 (94.3)	0.068
Right colon	298 (86.4)	285 (81.4)	0.076
Total	280 (81.2)	262 (74.9)	0.045
BBPS score, mean ± SD
Left colon	2.33±0.62	2.18±0.64	0.003
Transverse colon	2.41±0.55	2.28±0.58	0.002
Right colon	1.98±0.51	1.91±0.56	0.070
Total	6.71±1.15	6.37±1.31	<0.001
Bowel-cleansing grades, n (%)			0.006
Excellent	91 (26.4)	57 (16.3)
Good	189 (54.8)	205 (58.6)
Fair	64 (18.6)	85 (24.3)
Poor	1 (0.3)	3 (0.9)
Total polyps detected	735	696
Polyps per colonoscopy, median (IQR)	1 (0-3)	1 (0-2)	0.030
Polyp detection rate, n (%)	214 (62.0)	183 (52.9)	0.015
Cecal intubation rate, n (%)	344 (99.7)	349 (99.7)	0.992
Other endoscopic findings
Submucosal tumor	6 (1.7)	5 (1.4)	0.734
Colonic diverticula	17 (4.9)	26 (7.4)	0.171

*P-value was calculated using the χ2-test or Fisher’s exact test for categorical data. P-value was calculated using the t-test or Mann– Whitney U-test for continuous data

BBPS Boston Bowel Preparation Scale; IQR Interquartile Range