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Table 2 Distribution of histologic types of thyroid cancer stratified by age, gender, and tumor stage comparing firefighters with other occupation groups in the FCDS 1981–2014; Thyroid tumor analytic dataset

From: A comparative analysis of histologic types of thyroid cancer between career firefighters and other occupational groups in Florida

 

Total

n = 8,291

Firefighters

n = 120 (1.5%)

Service

n = 834 (10.1%)

White-collar

n = 4,893 (59.0%)

Blue-collar

n = 655 (7.9%)

Other a

n = 1,789(21.6%)

Overall n (%)

 Papillary

7,099 (85.6)

107 (89.2)

712 (85.4)

4,195 (85.7)

514 (78.5)

1,571 (87.8)

 Follicular

476 (5.7)

– –

44 (5.3)

291 (6.0)

55 (8.5)

76 (4.3)

 Rare type b

716 (8.6)

– –

78 (9.4)

407 (8.3)

86 (13.1)

142 (7.9)

 P-value*

 

ref

 < 0.001

 < 0.001

 < 0.001

 < 0.001

Age n (%)

 18 – 29 years old

  Papillary

735 (88.8)

13 (100.0)

81 (90.0)

337 (89.2)

28 (90.3)

276 (87.3)

  Follicular

50 (6.0)

– –

– –

25 (6.6)

– –

19 (6.0)

  Rare type b

43 (5.2)

– –

– –

16 (4.2)

– –

21 (6.7)

  P-value*

 

ref

0.281

0.231

0.339

0.179

 30 – 49 years old

  Papillary

3,361 (88.4)

64 (88.9)

344 (86.7)

2,049 (88.4)

229 (84.5)

675 (90.6)

  Follicular

202 (5.3)

– –

22 (5.4)

133 (5.7)

17 (6.3)

24 (3.2)

  Rare type b

241 (6.3)

– –

31 (7.8)

137 (5.9)

25 (9.2)

46 (6.2)

  P-value*

 

ref

0.009

0.016

0.007

0.004

 50 – 69 years old

  Papillary

3.003 (82.1)

30 (85.7)

287 (82.7)

1,809 (82.4)

257 (72.8)

620 (85.2)

  Follicular

224 (6.1)

– –

17 (4.9)

133 (6.1)

37 (10.5)

33 (4.5)

  Rare type b

432 (11.8)

– –

43 (12.4)

254 (11.6)

59 (16.7)

75 (10.3)

  P-value*

 

ref

0.006

0.008

0.003

0.007

Gender n (%)

 Male

  Papillary

1,483 (80.4)

84 (88.4)

138 (82.6)

817 (80.5)

320 (76.6)

124 (82.7)

  Follicular

141 (7.6)

– –

– –

81 (8.0)

39 (9.3)

– –

  Rare type b

221 (12.0)

– –

24 (–)

117 (11.5)

59 (14.1)

18 (–)

  P-value*

 

ref

 < 0.001

0.001

 < 0.001

 < 0.001

 Female

  Papillary

5,616 (87.1)

23 (92.0)

574 (86.1)

3,378 (87.1)

194 (81.9)

1,447 (88.3)

  Follicular

335 (5.2)

– –

39 (5.9)

210 (5.4)

16 (6.8)

68 (4.2)

  Rare type b

495 (7.7)

– –

54 (8.1)

290 (7.5)

27 (11.4)

124 (7.6)

  P-value*

 

ref

0.035

0.037

0.017

0.031

Tumor stage n (%)

 Early stage

  Papillary

4,899 (87.6)

68 (88.3)

503 (87.3)

2,927 (87.4)

330 (82.5)

1,071 (90.2)

  Follicular

385 (6.9)

– –

38 (6.6)

239 (7.1)

39 (9.8)

61 (5.1)

  Rare type b

306 (5.5)

– –

35 (6.1)

183 (5.5)

31 (7.8)

56 (4.7)

  P-value*

 

ref

0.005

0.006

0.003

0.004

 Late stage

  Papillary

2,029 (87.0)

38 (90.0)

187 (84.2)

1,179 (87.8)

171 (78.8)

454 (89.6)

  Follicular

64 (2.8)

– –

– –

33 (2.5)

14 (6.5)

10 (2.0)

  Rare type b

238 (10.2)

– –

30 (–)

131 (9.8)

32 (14.8)

43 (8.5)

  P-value*

 

ref

0.015

0.030

0.011

0.035

 Unknown stage

  Papillary

171 (46.2)

– –

22 (61.1)

89 (44.3)

13 (34.2)

46 (48.9)

  Follicular

27 (7.3)

– –

– –

19 (9.5)

– –

– –

  Rare type b

172 (46.5)

– –

– –

93 (46.3)

– –

43 (–)

  P-value*

 

ref

0.622

0.446

0.359

0.495

  1. Note: – – Represents sample sizes less than 10, which are not reported due to FCDS confidentiality rules– some data is suppressed to prevent back calculation of counts
  2. Percentages may not add up to 100% due to rounding
  3. a Other occupation includes farmworkers, retired, students, housewife/homemakers, and disabled
  4. b Rare types include other less common/aggressive histologic types of thyroid cancer which includes oxyphilic (27%), medullary (21%), carcinoma NOS (20%), anaplastic (10%), other rare, and unknown (22%)
  5. * P-value compares firefighter with each occupation group and adjusted for multiple comparison. Bold is significant using an adjusted Bonferroni protected probability of p-value =  < 0.00139
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BMC Endocrine Disorders

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