Table 2. Univariate and multivariate analysis of factors associated with inadequate bowel preparations.

Characteristics	Univariate unadjusted			Multivariate adjusted
	Odds ratio	P		Odds ratio	P
Elderly (age >65 years)	0.71	0.07		0.71	0.08
Male	126	0.13
Education level
Illiterate	Ref	N/A		Ref	N/A
High school	0.81	0.23		0.85	0.36
College	1.15	0.42		1.20	0.33
Grad school	0.56	0.10		0.59	0.14
Dementia	2.27	0.02		2.44	0.02
Gastroparesis	3.75	<0.01		3.97	0.01
Constipation	1.34	0.04		1.24	0.14
Tricyclic acid	2.42	0.04		2.24	0.07
Iron supplement	0.81	0.19
Inpatient opioid	1.78	<0.01		1.69	<0.01