Table 4.

Univariate and Multivariate Analyses to Predict Procedure Duration in Minutes for Stone Removal Cases

	Univariate			Multivariate
Variable	Coefficient	95% CI	p-value	Coefficient	95% CI	p-value
Stone burden (mm)
<10	Ref			Ref
≥10–20	12.05	1.43, 22.66	<0.05	14.76	4.18, 25.34	<0.05
≥20–30	27.39	12.68, 42.09	<0.05	29.92	15.34, 44.50	<0.05
≥30	39.57	24.26, 54.89	<0.05	40.35	25.04, 55.65	<0.05
Age (years)
<40	Ref			Ref
≥40–60	6.02	−8.34, 20.37	0.41	6.60	−6.80, 20.00	0.33
≥60	4.31	−10.55, 19.16	0.57	9.64	−4.38, 23.65	0.18
BMI (kg/m2)
<25	Ref			Ref
≥25–30	3.49	−9.60, 16.58	0.60	2.40	−9.70, 14.51	0.70
≥30–35	−3.84	−18.62, 10.94	0.61	−11.35	−24.91, 2.20	0.10
≥35	2.65	−11.29, 16.59	0.71	−1.49	−14.16, 11.19	0.82
LithoVue use	−13.07	−23.41, −2.73	<0.05	−14.00	−23.95, −4.04	<0.05

CI = confidence interval.