Table 2 Univariate analysis of the variations in ultrasonic characteristics between the LNM- group and the LNM + group

Tumor diameter (Mean ± SD, mm)

19.28 ± 7.86

21.43 ± 8.78

-2.204

0.028

Tumor size (n, %)

2.912

0.088

 T1

116 (63.4%)

62(53.4%)

 T2

67(36.6%)

54 (46.6%)

Distance from tumor to skin (Mean ± SD, mm)

6.66 ± 3.11

6.60 ± 2.97

0.164

0.869

Shape (n, %)

Fisher

1.000^a

 Regular

1 (0.5%)

0(0.0%)

 Irregular

182(99.5%)

116 (100.0%)

Orientation (n, %)

0.059

0.808

 Parallel

169 (92.3%)

108(93.1%)

 Not parallel

14 (7.7%)

8 (6.9%)

Margin (n, %)

8.575

0.073

 Circumscribed

1 (0.5%)

0(0.0%)

 Indistinct

105(57.4%)

53 (45.7%)

 Angular

35(19.1%)

20 (17.2%)

 Microlobulated

21(11.5%)

17 (14.7%)

 Spiculated

21(11.5%)

26 (22.4%)

Halo (n, %)

0.352

0.553

 Absent

162(88.5%)

100(86.2%)

 Present

21(11.5%)

16 (13.8%)

Echo pattern (n, %)

2.608

0.271

 Heterogeneous

4 (2.2%)

3(2.6%)

 Hypoecho

175(95.6%)

113 (97.4%)

 Isoecho or Hyperecho

4 (2.2%)

0(0.0%)

Posterior features (n, %)

12.104

0.007

 No features

148 (80.9%)

100(86.2%)

 Enhancement

22(12.0%)

2 (1.7%)

 Shadowing

3 (1.6%)

5(4.3%)

 Combined pattern

10 (5.5%)

9(7.8%)

Calcifications (n, %)

0.280

0.597

 Absent

26(14.2%)

14(12.1%)

 Present

157(85.8%)

102 (87.9%)

Vascularity (n, %)

0.175

0.916

 Absent

8 (4.4%)

4(3.4%)

 Internal vascular

108(59.0%)

70 (60.3%)

 Marginal vascular

67(36.6%)

42 (36.2%)