Table 2. Univariate and multivariate logistic regression models in the development group.

	Univariate analysis		Multivariate analysis
	OR (95%CI)	P value	OR (95%CI)	P value
Gender	4.59(2.52~8.37)	<0.001	4.54(2.14~9.62)	<0.001
Age, years	1.05(1.03~1.08)	<0.001	NA
Diabetes	2.25(1.11~4.45)	0.024	NA
Hypertension	2.14(1.25~3.68)	0.006	NA
Functional solitary kidney	4.47(2.28~8.75)	<0.001	3.02(1.28~7.14)	0.012
Previous surgery of calculi	2.43(1.42~4.17)	0.001	NA
Length of calculi size(mm)	1.07(1.03~1.11)	<0.001	NA
Width of calculi size(mm)	1.11(1.04~1.18)	0.002	NA
Mean CT attenuation value of calculi (HU)	1.00(1.00~1.00)	0.001	NA
Laterality of calculi	1.25(0.74~2.10)	0.408	NA
Location of calculi	0.69(0.50~0.95)	0.021	NA
Ipsilateral renal calculi	3.37(1.94~5.87)	<0.001	NA
Mean CT attenuation value of hydronephrosis (HU)	2.61(1.83~3.73)	<0.001	3.17(2.00~5.04)	<0.001
Degree of hydronephrosis	1.22(0.89~1.68)	0.222	NA
Urine WBC count	3.69(2.78~4.90)	<0.001	2.94(2.14~4.03)	<0.001
Urine nitrite	10.77(5.55~20.90)	<0.001	4.71(2.08~10.69)	<0.001

OR, odds ratio; CI, confidence interval; NA, not available; HU, Hounsfield unit.