TABLE 2.

Intraoperative and postoperative data.

	f‐URS group	Mini‐PCNL group	p value
Operation time (min), mean (SD), range	79.3 (10.3), 61–113	76.7 (8.7), 65–117	0.06
No use basket	80 (83.3%)	96 (100)	<0.001
Postoperative hospital stay (days), mean (SD), range	1.4 (0.6), 1–3	2.1 (0.7), 1–4	<0.001
Residual stone
Largest residual stone (mm), mean (SD), range	0.45 (1.1), 0–4	0.33 (1.2), 0–7	0.497
Residual stone volume (mm3), mean (SD), range	33.3 (90.3), 0–364	24.4 (103.5), 0–785	0.527
Stone volume clearance rate a (%), mean (SD), range	99.4 (1.6), 93.1–100.0	99.6 (1.8), 86.7–100.0	0.533
Complete stone‐free rate b , n (%)	82 (85.4%)	87 (90.6%)	0.266
Residual Stone after 1 months, n (%)	2 (2.0%)	4 (4.2%)	0.407
Hemoglobin drop c (g/dL), mean (SD), range	0.39 (0.25), 0–1.3	0.68 (0.60), 0–5.8	<0.001
Total complications d , n (%)	5 (5.2%)	13 (13.5%)	0.048
Fever (>38°C)	4 (4.2%)	7 (7.3%)
Emesis	1 (1.0%)	4 (4.2%)
Infection	0	3 (3.1%)
Transfusion	0	1 (1.0%)
Interventional embolization	0	1 (1.0%)	0.316

^a

$\text{Stone volume clearance rate}=\left(1-\frac{\text{residual stone volume}}{\text{preoperative stone volume}}\right)\times 100\%.$

^b Stone‐free rate (SFR): $\mathrm{SFR}=\left(\frac{\mathrm{No}.\text{of complete stone free patients}}{\mathrm{No}.\text{total patients}}\right)\times 100\%$.

^c Hemoglobin drop = Postoperative Hemoglobin − Preoperative Creatinine.

^d Clavien grade classification; Some cases had simultaneous complications.