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 4 Compliance of bowel preparation according to different preparation regimens

	Non-spilt-dose regimen	Split-dose regimen	P value
	n = 189	n = 189
Low-residue diet			0.542
< 3 d	54 (28.6%)	49 (25.9%)
≥ 3 d	134 (70.9%)	140 (74.1%)
Type of last meal			< 0.001
Rice porridge	110 (58.2%)	141 (74.6%)
Other low residue diet1	48 (25.4%)	25 (13.2%)
Normal or high residue diet	19 (10.1%)	4 (2.1%)
Time of last meal			< 0.001
As recommended or earlier	138 (73.0%)	176 (93.1%)
After recommendation	50 (26.5%)	11 (5.8%)
Dose of PEG/AA intake			0.736
2 L	185 (97.9%)	184 (97.4%)
< 2 L	4 (2.1%)	5 (2.6%)
Dose of water intake			0.081
≥ 1 L	185 (97.9%)	189 (100%)
< 1 L	3 (1.6%)	0 (0%)

¹Other low residue diet includes fish, egg, bread, potato, etc. AA: Ascorbic acid; PEG: Polyethylene glycol.