Table 3.

The variable assignment of multivariate logistic regression.

Factors	Variables	Assignment
Infection	Y	yes = 1, no = 2
Gender	X1	Female = 1, male = 2
Age	X2	≥60 = 1, <60 = 2
Diabetes	X3	Yes = 1, No = 2
Stone diameter (cm)	X4	≥2 = 1, <1 = 2
Duration of urinary tube insertion (days)	X5	≥3 = 1, <3 = 2
Duration of surgery (min)	X6	≥90 = 1, <90 = 2