Table 1 Univariate analysis of lateral cervical micro-lymph node metastases of papillary thyroid carcinoma was concentrated in the training and testing sets

Sex

0.044

0.524

 Male

15

75

9

22

 Female

74

198

14

47

Age

45(34,54)

36(29,45)

< 0.001

42.35(30.06,54.64)

36.80(25.97,47.63)

0.043

Diameter

1.31(0.85,1.89)

1.43(1.05,2.0)

0.093

0.98(0.69,1.47)

1.3(1.01,1.76)

0.027

Location

0.078

0.551

 Upper left

12

58

4

19

 Middle left

17

47

2

7

 Lowe left

16

26

5

10

 Upper right

15

64

4

17

 Middle right

10

38

6

8

 Lower right

19

40

2

8

Mulifocality

0.04

0.088

 No

85

240

22

53

 Yes

4

33

1

16

Benign nodule

0.51

0.273

 No

27

73

4

20

 Yes

62

200

19

49

Boundary

0.059

0.487

 Clear

61

214

16

53

 Dim

28

59

7

16

Echogenicity

0.826

0.448

 Hyperechoic/iso-echoic

3

14

2

3

 Hypoechoic

86

259

21

66

Composition

0.507

0.163

 Solid

84

263

20

66

 Solid dominate

5

9

3

3

 Cystic dominate

0

1

0

0

Texture

0.241

1

 Even

8

15

1

4

 Uneven

81

258

22

65

Microcalcification

0.145

0.39

 No

48

123

11

26

 Yes

41

150

12

43

Posterior feature

0.534

0.047

 Enhancement

0

0

2

0

 Attenuation

21

53

7

13

 Unaltered

63

209

13

54

 Mixed changes

5

11

1

2

Orientation

0.363

0.803

 Wider-than-tall

57

189

15

43

 Taller-than-wide

32

84

8

26

Halo

0.131

0.068

 No

75

246

18

65

 Yes

14

27

5

4

SLN

< 0.001

0.863

 No

25

29

4

9

 Yes

64

244

19

60

PLN

<0.001

0.112

 No

89

208

22

54

 Yes

0

65

1

15

CLNM

< 0.001

0.009

 Yes

22

221

11

53

 No

67

52

12

16

 Number of CLNM

0(0,0.5)

3(1,5)

<0.0001

0(0,3)

2(1,5)

0.013

HT

0.036

0.422

 No

57

206

18

48

 Yes

32

67

5

21

Capsular invasion

0.111

0.284

 No

81

230

22

58

 Yes

8

43

1

11