Table 2. Intra- and postoperative data.

PCNL Position (Prone / Supine)	63% / 37%
Number of Urinary Tracts	78% One / 22% Two
Hb level drop (mg/dL)	2.7 (Initial 13.4 - Final 10.7)
Ht level drop (%)	8.1 (Initial 40.7 - Final 32.6)
Transfusion (n; %)	5 cases; 18.5
Operative time (min)	138.3±36.7
Length of hospital stay (days)	5.6±3.9
Complications	8 (29.6%)-Clavien 2: 62.5% Clavien 3: 37.5%
Creatinine variation (mg/dL)	0.1 (Initial 1.5-Final 1.4)
Creatinine Clearence variation (mL/min/1.73m2)	0.5 (Initial 60.5-Final 60)
Stone-free rate (%)	67

Hb = Hemoglobin; Ht = Hematocrit