Table 2.

Results of Univariate and Multivariate Logistic Regression Analysis of Predictors of Colonoscopy Adherence in the Discovery Cohort

Characteristic	Univariate regression		Multivariate regression
	Odds ratio (95 % CI)	p value	Odds ratio (95 % CI)	p value
Age—per year	1.01 (0.98, 1.03)	0.62	0.98 (0.94,1.01)	0.16
Gender*
Female	1.00		1.00
Male	1.11 (0.70, 1.77)	0.66	1.81 (1.03,3.18)	0.04
Insurance type
Private carrier	1.00	<0.001	1.00	0.10
Medicare	3.11 (1.68, 5.75)	<0.001	2.23 (0.97,5.12)	0.06
MassHealth/medicaid/none	3.66 (2.03, 6.59)	<0.001	1.74 (0.86,3.54)	0.13
Education level*
No more than high school†	1.00		1.00
College or graduate school‡	0.35 (0.21, 0.56)	<0.001	0.65 (0.35,1.19)	0.16
History of colon polyps	0.85 (0.44, 1.64)	0.63	0.79 (0.34,1.82)	0.60
History of BRBPR or (+) FOBT§	1.86 (1.08, 3.20)	0.03	1.58 (0.81, 3.08)	0.18
CRC in first degree relative‖	1.12 (0.48, 2.62)	0.80	0.73 (0.25, 2.17)	0.57
History of psychiatric illness*	2.25 (1.40, 3.61)	<0.001	1.90 (1.08, 3.36)	0.03
NAR—per 10 % increase¶,*	3.97 (2.48, 6.35)	<0.001	2.79 (1.68, 4.64)	<.0.001
Wait time—per month#,*	1.14 (0.98, 1.32)	0.09	1.28 (1.07, 1.52)	0.006
Number of prior missed endoscopies—per missed endoscopy*	2.60 (1.60, 4.24)	<0.001	1.78 (1.07, 2.95)	0.03

This table presents results of univariate and multivariate logistic regression analyses of all potential predictors of colonoscopy non-adherence evaluated for inclusion in the non-adherence model. Analyses were performed in the discovery cohort

^*Included in final non-adherence prediction model

^†Completed grade school but no high school, some high school, and high school graduates

^‡Completed some college, college graduates, and those who have attended graduate school

^§ BRBPR bright red blood per rectum; FOBT fecal occult blood test

^‖ CRC colorectal cancer

^¶ NAR non-adherence ratio

^#1 month = 30 days