[Retracted] Surgery and Postoperative Care of Patients Undergoing Percutaneous Nephrolithotomy under the Guidance of B-Ultrasound Based on Smart Internet of Things

Table 3

Preoperative data of different complications.

Variable	Complication		Statistic value
	Normal group	Complication group
Age			0.862	0.263
Creatinine before operation (μmmol/L)			0.464	0.127
Stone size (mm)			0.903	0.548
Number of surgical channels			0.353	0.897
Operation time (min)			0.944	0.132
Antibiotic application days before surgery			0.829	0.431