Table 4.

Logistic regression analysis on the risk factors of postoperative urinary tract infection in patients with retrograde upper urinary lithotripsy.

Variables	β	S $\overline{\text{x}}$	OR	95% CI	P
Female	0.214	0.238	1.602	1.132∼2.472	.024
Age >50 y	0.871	0.112	2.247	1.346∼3.244	.032
Diabetes	0.405	0.124	2.228	1.033∼3.451	.019
Stone diameter ≥2 cm	0.834	0.215	2.152	1.395∼3.099	.025
Duration of urinary tube insertion ≥3 d	0.634	0.243	1.942	1.158∼2.632	.048
Duration of surgery ≥90 min	0.779	0.191	2.128	1.104∼3.846	.017