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Table 1 Distribution of risk factors for thyroid cancer among non-office, and office) workers

From: Thyroid cancer among female workers in Korea, 2007–2015

  Total Non-office Office
All (%) Cancer (%) χ2 testa All Cancer χ2 testa All Cancer χ2 testa
n = 149,258 n = 2614 (1.8)   n = 71,176 n = 1177 (1.7)   n = 78,082 n = 1437 (1.8)  
Age(years)    p = < 0.001    p = < 0.001    p = < 0.001
 15–19 990 (0.7) 3 (0.1)   622 (0.9) 2 (0.2)   368 (0.5) 1 (0.1)  
 20–24 17,402 (11.7) 121 (4.6)   8402 (11.8) 53 (4.5)   9000 (11.5) 68 (4.7)  
 25–29 33,063 (22.2) 413 (15.8)   13,758 (19.3) 172 (14.6)   19,305 (24.7) 241 (16.8)  
 30–34 23,160 (15.5) 376 (14.4)   8734 (12.3) 131 (11.1)   14,426 (18.5) 245 (17.0)  
 35–39 21,673 (14.5) 448 (17.1)   8271 (11.6) 154 (13.1)   13,402 (17.2) 294 (20.5)  
 40–44 18,364 (12.3) 421 (16.1)   9670 (13.6) 195 (16.6)   8694 (11.1) 226 (15.7)  
 45–49 16,458 (11.0) 422 (16.1)   9979 (14.0) 230 (19.5)   6479 (8.3) 192 (13.4)  
 50–54 10,173 (6.8) 247 (9.4)   6561 (9.2) 134 (11.4)   3612 (4.6) 113 (7.9)  
 55–59 5446 (3.6) 114 (4.4)   3462 (4.9) 69 (5.9)   1984 (2.5) 45 (3.1)  
 60–64 2529 (1.7) 49 (1.9)   1717 (2.4) 37 (3.1)   812 (1.0) 12 (0.8)  
Income decile    p = < 0.001    p = 0.0157    p = < 0.001
 0 (lowest) 0 (0.0) 0 (0.0)   0 (0.0) 0 (0.0)   0 (0.0) 0 (0.0)  
 1 26,560 (17.8) 486 (18.6)   13,676 (19.2) 228 (19.4)   12,884 (16.5) 258 (18.0)  
 2 22,208 (14.9) 358 (13.7)   12,365 (17.4) 206 (17.5)   9843 (12.6) 152 (10.6)  
 3 19,081 (12.8) 289 (11.1)   10,877 (15.3) 158 (13.4)   8204 (10.5) 131 (9.1)  
 4 19,096 (12.8) 246 (9.4)   9956 (14.0) 144 (12.2)   9140 (11.7) 102 (7.1)  
 5 15,773 (10.6) 256 (9.8)   8001 (11.2) 130 (11.0)   7772 (10.0) 126 (8.8)  
 6 13,051 (8.7) 219 (8.4)   5841 (8.2) 92 (7.8)   7210 (9.2) 127 (8.8)  
 7 12,740 (8.5) 240 (9.2)   4729 (6.6) 95 (8.1)   8011 (10.3) 145 (10.1)  
 8 11,420 (7.7) 248 (9.5)   3601 (5.1) 75 (6.4)   7819 (10.0) 173 (12.0)  
 9 9329 (6.3) 272 (10.4)   2130 (3.0) 49 (4.2)   7199 (9.2) 223 (15.5)  
 10 (highest) 0 (0.0) 0 (0.0)   0 (0.0) 0 (0.0)   0 (0.0) 0 (0.0)  
Smoking    p = < 0.001    p = 0.0075    p = 0.0011
 Never 142,373 (95.4) 2539 (97.1)   67,782 (95.2) 1143 (97.1)   74,591 (95.5) 1396 (97.1)  
 Former 2360 (1.6) 32 (1.2)   1031 (1.4) 8 (0.7)   1329 (1.7) 24 (1.7)  
 Current 4525 (3.0) 43 (1.6)   2363 (3.3) 26 (2.2)   2162 (2.8) 17 (1.2)  
Alcohol(times/week)    p = < 0.001    p = 0.0072    p = < 0.001
 0 120,686 (80.9) 2211 (84.6)   58,419 (82.1) 1007 (85.6)   62,267 (79.7) 1204 (83.8)  
 1–2 24,952 (16.7) 366 (14.0)   11,005 (15.5) 147 (12.5)   13,947 (17.9) 219 (15.2)  
  ≥ 3 3620 (2.4) 37 (1.4)   1752 (2.5) 23 (2.0)   1868 (2.4) 14 (1.0)  
BMI((kg/m2)    p = < 0.001    p = < 0.001    p = < 0.001
  < 18.5 15,365 (10.3) 170 (6.5)   6563 (9.2) 61 (5.2)   8802 (11.3) 109 (7.6)  
 18.5–24.9 110,945 (74.3) 1936 (74.1)   52,122 (73.2) 858 (72.9)   58,823 (75.3) 1078 (75.0)  
 25.0–29.9 19,933 (13.4) 447 (17.1)   10,922 (15.3) 238 (20.2)   9011 (11.5) 209 (14.5)  
  ≥ 30 3015 (2.0) 61 (2.3)   1569 (2.2) 20 (1.7)   1446 (1.9) 41 (2.9)  
Physical activity    p = < 0.001    p = 0.0818    p = < 0.001
 never 95,449 (63.9) 1556 (59.5)   46,349 (65.1) 738 (62.7)   49,100 (62.9) 818 (56.9)  
 1~ 2 times/week 35,381 (23.7) 678 (25.9)   16,246 (22.8) 274 (23.3)   19,135 (24.5) 404 (28.1)  
  ≥ 3 times/week 18,428 (12.3) 380 (14.5)   8581 (12.1) 165 (14.0)   9847 (12.6) 215 (15.0)  
Industry sectors    p = < 0.001    p = 0.6728    p = < 0.001
 Agriculture, forestry, fishing, mining and quarrying 492 (0.3) 13 (0.5)   297 (0.4) 7 (0.6)   195 (0.2) 6 (0.4)  
 Manufacture of beverages and food products 2401 (1.6) 43 (1.6)   1790 (2.5) 36 (3.1)   611 (0.8) 7 (0.5)  
 Manufacture of textiles and apparel 2985 (2.0) 52 (2.0)   1836 (2.6) 30 (2.5)   1149 (1.5) 22 (1.5)  
 Printing and printing related industry 1011 (0.7) 12 (0.5)   367 (0.5) 4 (0.3)   644 (0.8) 8 (0.6)  
 Manufacture of coke, briquettes, refined petroleum, chemicals and chemical products 1174 (0.8) 22 (0.8)   733 (1.0) 10 (0.8)   441 (0.6) 12 (0.8)  
 Manufacture of pharmaceuticals, medicinal chemical and botanical products 144 (0.1) 2 (0.1)   97 (0.1) 2 (0.2)   47 (0.1) 0 (0.0)  
 Manufacture of rubber and plastics products 885 (0.6) 12 (0.5)   605 (0.9) 7 (0.6)   280 (0.4) 5 (0.3)  
 Manufacture of glass and non-metallic mineral products 332 (0.2) 4 (0.2)   193 (0.3) 1 (0.1)   139 (0.2) 3 (0.2)  
 Manufacture of basic metals 1537 (1.0) 22 (0.8)   940 (1.3) 16 (1.4)   597 (0.8) 6 (0.4)  
 Manufacture of electronic components, computer; visual, sounding and communication equipment 4605 (3.1) 60 (2.3)   3602 (5.1) 50 (4.2)   1003 (1.3) 10 (0.7)  
 Manufacture of medical, precision and optical instruments, watches and clocks 314 (0.2) 3 (0.1)   199 (0.3) 0 (0.0)   115 (0.1) 3 (0.2)  
 Manufacture of electrical equipment 883 (0.6) 15 (0.6)   549 (0.8) 8 (0.7)   334 (0.4) 7 (0.5)  
 Manufacture of machinery and equipment 8727 (5.8) 133 (5.1)   6067 (8.5) 103 (8.8)   2660 (3.4) 30 (2.1)  
 Manufacture of motor vehicles, trailers and semitrailers, and transport equipment 2433 (1.6) 37 (1.4)   1820 (2.6) 29 (2.5)   613 (0.8) 8 (0.6)  
 Manufacture of wood, products of wood, cork and furniture 720 (0.5) 16 (0.6)   421 (0.6) 7 (0.6)   299 (0.4) 9 (0.6)  
 Other manufacturing 4244 (2.8) 57 (2.2)   3101 (4.4) 39 (3.3)   1143 (1.5) 18 (1.3)  
 Electricity, gas, steam, sewage, wastewater treatment services 602 (0.4) 11 (0.4)   237 (0.3) 2 (0.2)   365 (0.5) 9 (0.6)  
 Construction 4069 (2.7) 63 (2.4)   1207 (1.7) 19 (1.6)   2862 (3.7) 44 (3.1)  
 Wholesale and retail trade 14,168 (9.5) 262 (10.0)   6436 (9.0) 122 (10.4)   7732 (9.9) 140 (9.7)  
 Transportation 2720 (1.8) 42 (1.6)   1271 (1.8) 21 (1.8)   1449 (1.9) 21 (1.5)  
 Accommodation and food service activities 4038 (2.7) 68 (2.6)   2475 (3.5) 44 (3.7)   1563 (2.0) 24 (1.7)  
 Publishing activities, motion picture, broadcasting activities, telecommunications, information service activities 3527 (2.4) 58 (2.2)   1090 (1.5) 19 (1.6)   2437 (3.1) 39 (2.7)  
 Financial and insurance activities 7260 (4.9) 186 (7.1)   1450 (2.0) 33 (2.8)   5810 (7.4) 153 (10.6)  
 Real estate activities and rental and leasing activities 5168 (3.5) 91 (3.5)   2558 (3.6) 47 (4.0)   2610 (3.3) 44 (3.1)  
 Professional, scientific and technical activities 5022 (3.4) 70 (2.7)   1383 (1.9) 20 (1.7)   3639 (4.7) 50 (3.5)  
 Business facilities management and business support services 7722 (5.2) 111 (4.2)   4686 (6.6) 66 (5.6)   3036 (3.9) 45 (3.1)  
 Public administration and defense; compulsory social security 21,400 (14.3) 476 (18.2)   2805 (3.9) 59 (5.0)   18,595 (23.8) 417 (29.0)  
 Education 15,447 (10.3) 273 (10.4)   7329 (10.3) 126 (10.7)   8118 (10.4) 147 (10.2)  
 Human health and social work activities 16,158 (10.8) 251 (9.6)   10,948 (15.4) 174 (14.8)   5210 (6.7) 77 (5.4)  
 Arts, sports and recreation related services 1962 (1.3) 31 (1.2)   1066 (1.5) 17 (1.4)   896 (1.1) 14 (1.0)  
 Membership organizations, repair and other personal services 6357 (4.3) 107 (4.1)   3238 (4.5) 53 (4.5)   3119 (4.0) 54 (3.8)  
 Activities of households as employers 575 (0.4) 8 (0.3)   335 (0.5) 5 (0.4)   240 (0.3) 3 (0.2)  
 Activities of extraterritorial organizations and bodies 176 (0.1) 3 (0.1)   45 (0.1) 1 (0.1)   131 (0.2) 2 (0.1)  
  1. aχ2 test comparing the distribution in all sample and thyroid cancer cases