Table 1 Demographics and preoperative factors of obese and normal groups classified by BMI or VFA

Pts

71

25

42

54

Age, years (r; 43–96)

71.0 ± 10.6

70.8 ± 10.4

0.917

72.7 ± 11.4

69.7 ± 9.7

0.170

Gender, male/female

46/25

18/7

0.510

23/19

41/13

0.029

ASA-PS (r; 1–3)

2.2 ± 0.5

2.3 ± 0.5

0.429

2.2 ± 0.6

2.3 ± 0.5

0.519

Diseased side, right/left

31/40

10/15

0.750

19/23

22/32

0.658

Tumor size of renal tumor, mm (r; 15–81)

40.3 ± 18.4

41.1 ± 12.4

0.885

41.4 ± 18.0

40.1 ± 16.7

0.813

Renal arteries (r; 1–3)

1.3 ± 0.5

1.2 ± 0.4

0.539

1.2 ± 0.5

1.3 ± 0.5

0.740

Renal veins (r; 1–3)

1.1 ± 0.4

1.3 ± 0.4

0.057

1.1 ± 0.4

1.2 ± 0.4

0.551

BMI, kg/m² (r; 16.6–35.7)

21.8 ± 2.0

28.1 ± 2.7

< 0.001

–

–

–

VFA, cm² (r; 2.0–295.1)

–

–

–

57.8 ± 39.9

156.0 ± 42.2

< 0.001