Is a split-dose regimen of 2 L polyethylene glycol plus ascorbic acid tolerable for colonoscopy in an early morning visit to a comprehensive medical check-up?

Table 2 Demographics and clinical characteristics of patients n (%)

	Non-spilt-dose regimen	Split-dose regimen	P value
	n = 189	n = 189
Gender			0.753
Male	111 (58.7)	114 (60.3)
Female	78 (41.3)	75 (39.7)
Age (yr)	53.4 ± 10.9	51.8 ± 9.3	0.110
Previous examination			0.547
Screening	43 (22.8)	48 (25.4)
Surveillance	146 (77.2)	141 (74.6)
Bowel movement (wk-1)	7.1 ± 3.3	7.1 ± 3.5	0.738
Medications for constipation			0.869
Yes	5 (2.6)	4 (2.1)
No	169 (89.4)	172 (91.0)