Split-dose vs same-day reduced-volume polyethylene glycol electrolyte lavage solution for morning colonoscopy

Table 2 Comparison of technical performance of colonoscopy, quality of bowel preparation and patient tolerability between groups

Technical performance	Whole-dose same-morning	Split-dose	P
	n = 152	n = 143
Completed colonoscopy	98.7%	98.6%	1.000
Cecal intubation time, s	600 (432-900)	657 (480-980)	0.510
Withdrawal time, s	298 (180-418)	244 (180-348)	0.235
Total colonoscopy time, s	960 (660-1320)	960 (720-1304)	0.888
Adenoma detection rate	31.6%	30.1%	0.779
Number of adenoma detected	1 (1-2)	2 (1-3)	0.010
Boston bowel preparation scale
Right	2 (2-2)	2 (2-3)	0.060
Transverse	2 (2-3)	2 (2-3)	0.119
Left	2 (2-3)	2 (2-3)	0.176
Total	6 (6-7)	6 (6-8)	0.038
Overall grading of quality of bowel preparation
Good or intermediate	92.1%	97.2%	0.071
Poor	7.9%	2.8%
Completed bowel preparation	94.1%	99.3%	0.020
Difficult to complete bowel preparation	61.2%	29.4%	< 0.001
Will try another preparation	78.9%	53.8%	< 0.001
Refuse the same preparation	13.8%	6.3%	0.033
Barely tolerable or unacceptable taste	7.9%	5.6%	0.432
Nausea	37.5%	25.2%	0.023
Vomiting	16.4%	8.4%	0.037
Abdominal pain	19.7%	13.3%	0.137
Bloating	32.2%	30.1%	0.688
Chest pain	3.9%	5.6%	0.506
Dizziness	10.5%	9.8%	0.834
Level of comfort during bowel preparation
Unfavourable response	28.3%	18.9%	0.058
Favourable response	71.7%	81.1%