Efficacy of morning-only 4 liter sulfa free polyethylene glycol vs 2 liter polyethylene glycol with ascorbic acid for afternoon colonoscopy

Table 1 Demographics and baseline characteristics

	4-L SF-PEG n = 104		2-L PEG + Asc n = 102		P value
	Mean	SD	Mean	SD
Age	55.933	7.6161	57.402	7.9892	0.1781
BMI	29.237	6.6711	29.266	5.4687	0.9729
Gender (% male)	59.6%		62.7%		0.6450
Had prior colonoscopy	43.7%		44.0%		0.5537
Race:
African American	8.7%		7.8%		0.8719
White	29.8%		42.2%		0.0836
Hispanic	53.8%		43.1%		0.1365
Other	7.3%		6.9%		0.7767
Reason for colonoscopy:
Screening	65.4%		65.6%		0.3251
History of polyps	24.0%		28.4%		0.7241
1st Degree relative with colon CA	10.0%		6.0%		0.0311
Household income:
< $25K	6.52%		9.28%		0.4958
$25-75K	32.6%		25.8%		0.2327
$75K	23.9%		20.6%		0.5502
$100K	37%		44.3%		0.2153
Education (highest level):
Post-graduate	27.7%		30.2%		0.5616
College	55.3%		51.0%		0.4707
High school	13.8%		16.7%		0.5815
Middle school	3.19%		1.4%		0.2892
Elementary school	0%		1.4%		0.9940
Time of colonoscopy:
1-2 PM	35%		33%		0.8460
2-3 PM	35%		31%		0.6206
3-4 PM	23%		28%		0.3801
4-5 PM	8%		7%		0.8187

SF-PEG: Sulfa-free polyethylene glycol; PEG + Asc: Polyethylene glycol solution with ascorbic acid.

Table 2 Colonoscopy data

	4-L SF-PEGn = 104		2-L PEG + Ascn = 102		P value
	Mean	SD	Mean	SD
Ottawa scores:
O-F	0.635	0.6241	0.618	0.6607	0.8499
O-L	1.327	0.7688	1.569	0.7381	0.0224
O-M	0.875	0.8324	1.029	0.8139	0.1799
O-R	1.375	0.6853	1.627	0.7025	0.0097
O-T	4.212	1.9690	4.853	1.9109	0.0186
OT < 6 - optima prep	84%		61%		0.0003
Polyp detection rate	59.6%		55.9%		0.5877
Total polyps found	1.25	1.5057	1.216	1.5455	0.8719
Adenomas	38%		37%		0.8583
Advanced adenomas	10.6%		7.8%		0.4932

SF-PEG: Sulfa-free polyethylene glycol; PEG + Asc: Polyethylene glycol solution with ascorbic acid.

Table 3 Patient satisfaction survey

	4-L SF-PEG n = 104	2-L PEG +Asc n = 102	P value
	Mean	Mean
Patient who drank entire amount of bowel preparation	78.60%	92.20%	0.0142
Patients who would choose bowel prep again	78.40%	86.10%	0.1882
Patients who would recommend their bowel preparation	82.70%	86.30%	0.4788
Patients who felt that the flavor of their bowel prep was pleasant	70.90%	59.80%	0.0899
Patients satisfied with their bowel preparation process	89.40%	90.20%	0.3183
Patients who had difficulty completing their prep	25.00%	22.00%	0.6688
Symptoms:
Bloating	11.50%	23.1	0.0235
Abdominal pain	1.00%	1.90%	0.5495
Nausea	23.10%	21.20%	0.7949
Vomiting	2.90%	3.80%	0.6813

SF-PEG: Sulfa-free polyethylene glycol; PEG + Asc: Polyethylene glycol solution with ascorbic acid.