Table 1 Characteristics of clinical parameters and conventional ultrasound characteristics in the malignant and benign groups

Gender, n (%)

Male

61 (61.6%)

13 (31.7%)

10.408

0.001

Female

38 (38.4%)

28 (68.3%)

Age (years): mean ± STD

59.290 ± 11.972

55.980 ± 6.984

1.659

0.099

Laterality, n (%)

Left

58 (58.6%)

25 (61.0%)

0.069

0.851

Right

41 (41.4%)

16 (39.0%)

Location, n (%)

Superior

34 (34.3%)

9 (22.0%)

2.538

0.281

Middle

35 (35.4%)

15 (36.6)

Inferior

30 (30.3%)

17 (41.5%)

Surgery, n (%)

Radical nephrectomy

47 (47.5%)

3 (7.3%)

47.089

< 0.001

Partial nephrectomy

52 (52.5%)

24 (58.5%)

Unoperated

0 (0%)

14 (29.3)

Component, n (%)

Solid

83 (83.85)

41 (100%)

7.481

0.003

Solid-cystic

16 (16.2%)

0 (0%)

Echogenicity, (n/%)

Hyper-

25 (25.3%)

27 (65.9%)

20.926

< 0.001

Iso-

2 (2.0%)

1 (2.4%)

Hypo-

72 (72.7%)

13 (31.7%)

Boundary, n (%)

Well defined

92 (92.9%)

37 (90.2%)

0.289

0.731

Poorly defined

7 (7.1%)

4 (9.8%)

Shape, n (%)

Regular

90 (90.9%)

37 (90.2%)

0.015

1.000

Irregular

9 (9.1%)

4 (9.8%)

necrosis,

n (%)

present

80 (80.8%)

13 (31.7%)

31.343

< 0.001

absent

19 (19.2%)

28 (68.3%)

CDFI, n(%)

0

12 (12.1%)

11 (26.8%)

9.006

0.029

I

36 (36.4%)

19 (46.3%)

II

21 (21.2%)

6 (14.6%)

III

30 (30.3%)

5 (12.2%)

Calcification, n(%)

Yes

5 (5.1%)

1 (2.4%)

0.482

0.671

No

94 (94.9%)

40 (97.6%)

Tumor diameter(cm): mean ± STD

4.771 ± 2.434

4.283 ± 2.077

1.124

0.263