Table 1 Changing trends of onset age, sex distribution and pathological classifications of thyroid cancer in different periods

 Overall

44.7 ± 12.5

39.9 ± 13.9

41.3 ± 13.8

45.1 ± 12.3

  Male

45.8 ± 13.3

41.7 ± 15.7

45.9 ± 14.6

45.9 ± 13.1

  Female

44.3 ± 12.2

38.4 ± 12.1

39.3 ± 13.0

44.8 ± 12.0

  P

< 0.001

0.209

< 0.001

< 0.001

  Male

3458 (27.6)

54 (45.4)

334 (30.3)

3070 (27.2)

  Female

9050 (72.4)

65 (54.6)

768 (69.7)

8217 (72.8)

 Male-to-female ratio

0.38

0.83

0.43

0.37

  PTC^a

10,979 (94.9)

73 (78.5)

795 (82.9)

10,111 (96.1)

  FTC^b

303 (2.6)

11 (11.8)

65 (6.8)

227 (2.2)

  MTC^c

214 (1.8)

5 (5.4)

72 (7.5)

137 (1.3)

  PDTC^d

73 (0.6)

4 (4.3)

27 (2.8)

42 (0.4)