Table 4.

Results of the Linear Regression Analysis of Factors Leading to Prolonged Cecal Intubation Time.

Factors	Univariate analysis				Multivariate analysis
	β-coefficient (95% CI)	Standard error	P-value		β-coefficient (95% CI)	Standard error	P-value
Older age, years	0.020 (-0.069–16.796)	0.046	0.633
BMI
Normal (18.5–25.0 kg/m2)	1
Low (<18.5 kg/m2)	0.260 (-3.124–3.644)	1.717	0.880
High (>25.0 kg/m2)	2.130 (-1.027–5.286)	2.130	0.185
History of colonoscopy
	1
	0.522 (-1.829–2.873)	1.193	0.662
Previous abdominal surgery
	1
	1.173 (-1.184–3.530)	1.196	0.328
Routine use of laxatives
	1
	0.496 (-3.139–4.130)	1.844	0.788
Inadequate bowel preparation*
	1				1
	3.583 (0.578–6.588)	1.525	0.020		3.583 (0.578–6.588)	1.525	0.020
Sigmoid colon diverticulosis
	1
	1.799 (-1.438–5.037)	1.643	0.275
Use of a small-caliber colonoscope
	1
	-1.326 (-3.671–1.018)	1.190	0.266
Inexperienced operator
	1
	0.908 (-1.630–3.446)	1.288	0.481

BMI, body mass index; CI, confidence interval

* Fair, poor, or inadequate based on the Aronchick Bowel Preparation scale.