Table 2. Outcomes of the pcNL for complex stones (Guy's Stone Score 3 or 4) according to a prone or supine position.

	Supine	Prone	P
Immediate Success Rate
(fragments ≤ 4 mm on the CT scan on POD1)	38.5%	27.7%	0.1689
Clavien ≥ 3	9.6%	9.8%	0.9545
Surgical time (mean ± SD (min))	134.1 (53.4)	138.2 (42.7)	0.5770