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Table 2 Operation-related parameters

From: One-stage efficacy of single tract minimally invasive ECIRS in the improved prone frog split-leg position for staghorn stones

Characteristic stmECIRS stmPNL P value
Operative time (min) 105.0 (85.0, 124.0)b 99.0 (75.8, 150.3)b 0.996a
Hb drop (g/dL) 2.4 (1.7, 3.1)b 2.1 (1.5, 2.7)b 0.353a
Scr up (umol/L) − 2.46 ± 8.97 − 1.89 ± 12.80 0.814
Hospitalization time (d) 10.0 (8.0, 13.0)b 11.5 (10.0, 14.1)b 0.082a
One-stage stone free (%) 38 (84.4) 22 (57.9) 0.007
Complications 0.345
 Fever (> 38.5 ℃) (%) 1 (2.2) 0 1.0c
 Hemorrhage (%) 4 (8.9) 7 (18.4%) 0.202
 Blood transfusion (%) 2 (4.4) 2 (5.3) 0.862
Clavien grade
 0 (%) 40 (88.9) 31 (81.6) 0.345
 I (%) 3 (6.7) 5 (13.1) 0.318
 II (%) 2 (4.4) 2 (5.3) 0.862
 ≥ III (%) 0 0  
  1. StmPNL Group: single tract minimally invasive percutaneous nephroscopy in prone position was performed for the patients in the prone position
  2. StmECIRS Group: single tract minimally invasive endoscopic combined intrarenal surgery was performed in the improved prone frog split-leg position
  3. Hb: Hemoglobin; Scr: serum creatinine
  4. aMann–Whitney U test was used when normal distribution was not obeyed
  5. bNon-normally distributed continuous variables were represented by the median (quartile)
  6. cSince the data frequency contains “0”, the result of Fisher's Exact Test in the Chi-square Test was used