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

Table 2 Analysis of factors related to intestinal preparation in patients (n = 484), mean ± SD/n (%)

	Successful bowel preparation (n = 359)	Poor bowel preparation (n = 125)	t/χ2 value	P value
Anesthesia and surgery	305 (85.0)	98 (78.4)	2.862	0.091
Low-residue diet 1 day prior	286 (79.7)	40 (32.0)	95.805	< 0.001a
High-fiber food intake within 24 hours	86 (24.0)	47 (37.6)	8.662	0.003a
First-time colonoscopy	242 (67.4)	68 (54.4)	6.815	0.009a
Complete intake of sodium potassium magnesium sulfate	336 (93.6)	116 (92.8)	0.095	0.759
Time interval from first dose to first bowel movement (minutes)	59.54 ± 2.98	70.92 ± 7.23	-1.723	0.086
Time interval from last dose to start of examination (hours)	6.53 ± 0.10	8.24 ± 0.26	-6.192	< 0.001a
Total exercise time after medication (minutes)	87.76 ± 3.65	46.04 ± 5.80	5.502	< 0.001a
Total number of bowel movements after medication (times)	10.52 ± 0.19	9.09 ± 0.31	3.799	< 0.001a

^aP < 0.05.