Table 1 Population characteristics (N = 1749)

Age (years)*

41.52 ± 11.52

–

< 55/≥ 55 years

1532/217

87.6/12.4

Male/female

491/1258

28.1/71.9

¹³¹I ablation

940

53.7

BMI*

23.18 ± 3.91

–

< 24/≥ 24

1126/623

64.4/35.6

Hypertension

144

8.2

Diabetes

46

2.6

Hypothyroidism

26

1.5

Hyperthyroidism

47

2.7

HD

387

22.1

NG

908

51.9

Tumor located at isthmus

85

4.9

Bilaterality

248

14.2

Multifocality

421

24.1

Tumor size (mm)*

13.66 ± 8.94

–

Capsular invasion

366

20.9

Minor ETE

170

9.7

Major ETE

100

5.7

UCND/BCND

403/1346

23.0/77.0

ULND/BLND

328/45

18.8/2.6

Carbon nanoparticles

1287

73.6

Tx/T1a/T1b/T2/T3a/T3b/T4a/T4b

10/652/493/118/241/160/73/2

0.6/37.3/28.2/6.7/13.8/9.1/4.2/0.1

Nx/N0/N1a/N1b

12/857/525/355

0.7/49.0/30.0/20.3

M0/M1

1742/7

99.6/0.4