Table 2 Univariate logistic regression analysis for association of index variables and adherent perinephric fat (APF)

Gender

0.001

 Male

4.963 (1.857–13.264)

 Female

Reference

Age (years)

1.020 (0.993–1.047)

0.145

BMI (kg/m²)

1.171 (1.058–1.296)

0.002

Hypertension

0.092

 Yes

1.842 (0.905–3.749)

 No

Reference

Diabetes mellitus

0.214

 Yes

1.607 (0.761–3.396)

 No

Reference

Tobacco use

0.178

 Yes

1.617 (0.803–3.257)

 No

Reference

Dyslipidemia

0.783

 Yes

0.907 (0.452–1.819)

 No

Reference

Preoperative creatinine (μmol/l)

1.010 (0.998–1.023)

0.101

Preoperative eGFR (ml/min/1.73 m²)

0.983 (0.972–0.995)

0.004

Tumor size (cm)

1.214 (0.970–1.521)

0.090

Tumor location

0.493

 Left side

1.269 (0.642–2.511)

 Right side

Reference

Pathological stage

0.290

 pT1a

Reference

 > pT1a

1.448 (0.729–2.877)

Histological subtype

0.103

 ccRCC

Reference

 Non-ccRCC

0.437 (0.161–1.184)

Fuhrman grade

0.234

 I

Reference

 II

3.086 (0.384–24.783)

 III

5.400 (0.607–48.078)

Renal capsular invasion

0.548

 Yes

1.269 (0.583–2.761)

 No

Reference

Perinephric fat invasion

0.828

 Yes

0.841 (0.177–3.994)

 No

Reference

RENAL nephrometry score

1.065 (0.885–1.282)

0.506

Posterior fat thickness (cm)

38.141 (12.524–116.156)

< 0.001

Perinephric stranding

< 0.001

 None

Reference

 Mild/moderate

5.839 (1.821–18.719)

 Severe

70.667 (20.078–248.724)

MAP score

8.945 (4.160–19.236)

< 0.001