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

Table 2

Qualitative patient data.

Variable	Classification and assignment	Number of cases
Gender	1: female	357
	2: male	524
Generation	1: ≤60	217
	2: >60	509
History of preoperative diabetes	0: no	170
	1: yes	813
Affected side	1: left	428
	2: right	437
Positive urine culture	0: negative	736
	1: positive	143