. Author manuscript; available in PMC: 2016 Mar 1.

Published in final edited form as: Gastrointest Endosc. 2015 Mar;81(3):691–699.e1. doi: 10.1016/j.gie.2014.10.032

Appendix 1.

Evaluation of the association between potential covariates and bowel cleanliness and presence of polyps and adenomas at Boston Medical Center (a) and within the Clinical Outcomes Research Initiative (b).

(a) Boston Medical Center

Variable	OR [95% CI]
Variable	Bowel cleanliness (BBPS)	Polyps	Adenomas
Age	0.99 [0.98-1.0]	1.02 [1.01-1.03]	1.03 [1.02-1.04]
Gender (ref=male)	1.4 [1.2-1.5]	0.57 [0.50-0.65]	0.61 [0.54-0.70]
Race/ethnicity (ref=Non-Hispanic white) Non-Hispanic black Hispanic Other	0.73 [0.61-0.87] 0.71 [0.58-0.87] 0.69 [0.56-0.86]	0.68 [0.57-0.81] 0.63 [0.52-0.77] 0.62 [0.50-0.76]	0.70 [0.59-0.85] 0.69 [0.56-0.84] 0.70 [0.57-0.83]
DM	0.50 [0.49-0.70]	1.2 [0.98-1.4]	1.2 [1.0-1.5]
BMI	1.0 [1.0-1.0]	1.0 [1.0-1.0]	1.0 [1.0-1.0]

(b) Clinical Outcomes Research Initiative

	OR [95% CI]
Variable	Bowel cleanliness (BBPS)	Polyps
Age	0.99 [0.98-0.99]	1.01 [1.01-1.03]
Gender (ref=male)	1.4 [1.3-1.5]	0.51 [0.46-0.56]

BBPS, Boston Bowel Preparation; BMI, body mass index; CI, confidence interval; DM, diabetes mellitus; OR, odds ratio; ref, reference