Risk factors for inadequate bowel preparation before colonoscopy: A retrospective cohort study

Table 3 Logistic regression analysis of factors influencing inadequate bowel preparation for colonoscopy (n = 484)

Independent variable	β coefficient	SE	Wald χ2	OR	95%CI	P value
History of colorectal surgery	1.762	0.586	9.054	5.814	1.848-18.519	0.003
Low-residue diet 1 day prior	-1.928	0.287	45.215	0.145	0.083-0.255	< 0.001
Time interval from last dose to start of examination (hours)	0.369	0.074	25.189	1.447	1.252-1.669	< 0.001
Total exercise time after medication (minutes)	-0.008	0.003	8.962	0.992	0.986-0.997	0.003
Total number of bowel movements after medication (times)	-0.105	0.04	7.011	0.900	0.832-0.973	0.008

OR: Odds ratio; CI: Confidence interval.