Table 1 Patients’ preoperative demographics

Gender

 Male

16

16

1.000

 Female

6

6

Age (years, mean ± SD)

54.36 ± 12.07

54.41 ± 10.40

0.989

Height (cm, mean ± SD)

166.68 ± 6.59

166.09 ± 7.49

0.782

Weight (kg, mean ± SD)

71.00 ± 11.77

66.52 ± 9.01

0.164

BMI (kg/cm², mean ± SD)

25.43 ± 2.83

24.10 ± 2.76

0.122

Tumor size (mm, mean ± SD)

19.86 ± 5.48

19.14 ± 5.97

0.676

Tumor size intra-kidney (mm, mean ± SD)

18.46 ± 4.13

17.68 ± 4.69

0.565

Side of the kidney

 Left

12

7

0.128

 Right

10

15

Position of tumor

 Upper pole

5

4

0.831

 Middle

10

12

 Lower pole

7

6