Table 1 Baseline Characteristics

Age at surgery (years)

59

(51–68)

57

(49–67)

0.183

Sex

Male

346

(71.34%)

106

(65.43%)

0.156

Female

139

(28.66%)

56

(34.57%)

BMI (kg/m^2)

29

(26–33)

29

(27–33)

0.166

ASA Score

Low Grade (1–2)

365

(75.88%)

102

(70.83%)

0.221

High Grade (3–4)

116

(24.12%)

42

(29.17%)

Pre-Op GFR (mL/min/1.73 m2)

81.30

(66.26–92.16)

78.08

(62.69–93.38)

0.560

Pre-Op CKD Staging

LG (Stages 1–2)

HG (Stages 3–5)

414

71

(85.36%)

(14.64%)

130

31

(80.75%)

(19.25%)

0.164

Tumor Size (cm)

2.6

(1.9–3.7)

2.8

(2.1-4.0)

0.142

Clinical Stage

cT1a

398

(82.06%)

124

(76.54%)

0.123

cT1b

87

(17.94%)

38

(23.46%)

RENAL Nephrometry Score

Low (4–6)

252

(56.25%)

83

(54.61%)

0.229

Moderate (7–9)

187

(41.74%)

62

(40.79%)

High (10–12)

9

(2.01%)

7

(4.61%)

Exophytic versus Endophytic

≥ 50% exophytic

< 50% exophytic

Entirely endophytic

311

118

19

(69.42%)

(26.34%)

(4.24%)

94

42

16

(61.84%)

(27.63%)

(10.53)

0.017

Nearness to Collecting System (mm)

10

(2–20)

10

(2–20)

0.304

Location Relative to Polar Lines

Entirely above/below

< 50% across

Majority between/interpolar

196

146

106

(43.75%)

(32.59%)

(23.66%)

61

60

31

(40.13%)

(39.47%)

(20.39%)

0.304

Pathologic Stage

pT1a

383

(78.97%)

123

(75.93%)

0.736

pT1b

75

(15.46%)

29

(17.90%)

pT2a

1

(0.21%)

0

(0%)

pT2b

0

(0%)

0

(0%)

pT3a

26

(5.36%)

10

(6.17%)

Tumor Grade

Low Grade (1–2)

High Grade (3–4)

Not Reported

39

3

443

(8.04%)

(0.62%)

(91.34%)

19

3

140

(11.73%)

(1.85%)

(86.42%)

0.107

RCC Subtype

Clear Cell

293

(60.41%)

99

(61.11%)

0.985

Papillary

24

(4.95%)

9

(5.56%)

Papillary Type 1

71

(14.64%)

21

(12.96%)

Papillary Type 2

15

(3.09%)

6

(3.70%)

Chromophobe

44

(9.07%)

14

(8.64%)

Other

Unclassified

34

4

(7.01%)

(0.82%)

11

2

(6.79%)

(1.23%)