Table 2 Operative outcome comparison between two groups(\( \overline{x} \) ±s)

Operation time (min)

54.5 ± 14.5

70.2 ± 11.7

<0.001

Bleeding amount (ml)

126.4 ± 47.2

321.6 ± 82.5

<0.001

Stone-free rates

96.7% (88)

73.6% (67)

<0.001

 Fever ≥ 38.5 °C

10

25

<0.001

 Bleeding amount ≥ 800 ml

0

15

<0.001

 Renal pelvic perforation

1

7

<0.001

 Days for hospitalization

6.4 ± 2.3

10.6 ± 3.7

<0.001