Table 2.

Surgery-related variables and post-operative outcomes

2a. Surgery-related variables
	Total: 122
Laterality N° (%)
Right	55 (45.1)
Left	67 (54.9)
Access tract number, N° (%)
Single	111 (91)
Multiple	11 (9)
Access tract location, N° (%)
Lower calix	84 (68.8)
Middle calix	20 (16.4)
Upper calix	9 (7.4)
Multiple locations	9 (7.4)
Median total laser energy (IQR), kJ	8.63 (3,75–16,23)
Lapaxy modality, N° (%)
Clear Petra Suction	78 (63.9)
Clear Petra Suction + basket	44 (36.1)
Exit strategy, N° (%)
Nephrostomy	97 (79.5)
Ureteric catheter/JJ stent	5 (4.1)
Nephrostomy + Ureteric catheter /JJ stent	20 (16.4)
Intra-operative complications, N° (%)
Contrast medium blow-out	2 (1.6)
Median operative time (IQR), minutes	90 (71–120)
Median lithotripsy + lapaxy time (IQR), minutes	28 (17–45)

2b. Post-operative outcomes
Median Hb drop (IQR) g/dL	1,5 (0.6–2.1)
Transfusions, N° (%)	1 (0.8)
Complications, N° (%)	31 (25.4)
Clavien 1	14 (11.4)
Clavien 2	10 (8.2)
Clavien 3A	4 (3.3)
Clavien 3B	3 (2.5)
Median nephrostomy time (IQR), days	3 (2–4)
Median urethral catheter time (IQR), days	1 (1–1)
Median length of hospital stay (IQR), days	4 (3–5)
Stone Clearance Rate, N° (%)	87 (71.3)
Retreatment, N° (%)	9 (7.4)