Table 2.

The effect of preassessment on the quality of bowel preparation for risk groups, using binary logistic regression.

Risk groups	Number of patients	Percentage	Preassessment		p value	Odds ratio
			Yes	No
Group 1	258	15.1	65	193	0.158	1.80
Group 2	607	35.6	141	466	0.063	1.79
Group 3	839	49.2	198	641	0.039	1.52
All groups	1704		404	1300	0.002	1.61
CKD	88		28	60	0.006 (Mann–Whitney)

CKD: chronic kidney disease.