Table 2 Comparison of clinicopathological characteristics between the no ETE and mETE groups.

From: Factors influencing extrathyroidal extension of papillary thyroid cancer and evaluation of ultrasonography for its diagnosis: a retrospective analysis

Variable

Extent of ETE

P value

χ2

Z

No ETE

mETE

Longest diameter

 ≤ 2 cm

760

856

 < 0.001

36.680

 

 > 2 cm

38

130

   

Lesion sitea

 Left

361

435

0.013

8.614

 

 Right

418

500

   

 Isthmus

19

50

   

Central lymph node metastasis

 Yes

240

479

 < 0.001

62.773

 

 No

558

507

   

Lateral lymph node metastasis

 Yes

46

183

 < 0.001

64.538

 

 No

752

803

   

Serum markers

 TSH (μIU/mL)b

1.504

1.624

0.044

 

 − 2.016

 TG-Ab (IU/mL)b

16.1

15.55

0.023

 

 − 2.271

 TPO-Ab (IU/mL)b

38.2

34.8

 < 0.001

 

 − 3.715

 Tg (ng/mL)b

11.000

12.925

 < 0.001

 

 − 3.578

  1. ETE, extrathyroidal extension; mETE, minor extrathyroidal extension; TSH, thyroid-stimulating hormone; TG-Ab, anti-thyroglobulin; TPO-Ab, anti-thyroid peroxidase; Tg, thyroglobulin.
  2. aOne patient with papillary thyroid carcinoma had the entire thyroid affected.
  3. bMedian, assessed using the rank-sum test.
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