Predictors of suboptimal bowel preparation in asymptomatic patients undergoing average-risk screening colonoscopy

Table 2 Adjusted estimates [odds ratio (95%CI)] of predictors of suboptimal bowel preparation

Suboptimal bowel prep
Predictors	OR (95%CI)1
Age (yr)
50-59	1.0
60-69	1.1 (0.84-1.4)
≥ 70	1.0 (0.67-1.6)
Male gender	0.99 (0.77-1.3)
Race
White	1.0
Black	1.7 (1.2-2.4)
Other	1.2 (0.80-1.8)
Body mass index (kg/m2)
< 30	1.0
≥ 30	1.3 (0.99-1.6)
Clinical
Narcotics use	1.8 (1.3-2.5)
TCA use	2.5 (1.4-4.6)
Diagnosis of diabetes	2.3 (1.7-3.1)
GI fellow present	1.1 (0.82-1.6)
Polyps detected	0.85 (0.68-1.1)
Bowel prep type
4L PEG 3350	1.0
8L PEG 3350	0.52 (0.30-0.91)
MiraLAX®/Gator ade®	0.55 (0.39-0.76)
Other	0.76 (0.54-1.1)
Endoscopy site
UMich Satellite Outpatient Units	1.0
UMich in-Hospital Outpatient Unit	1.3 (0.94-1.8)
Veterans Affairs in-Hospital Unit	1.6 (1.2-2.3)

¹Effect adjusted for endoscopy site and GI fellow presence. TCA: Tricyclic antidepressants; GI: Gastroenterology; PEG: Polyethylene glycol; OR: Odds ratio.