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Table 3 Excess relative risks per 100 mGy for thyroid cancer with 5-year lag by occupational history among South Korean medical radiation workers, 1996–2015

From: Thyroid cancer risks among medical radiation workers in South Korea, 1996–2015

  All Employment duration ≥1 year
Cases ERRa per 100 mGy (95% CI) Cases ERRa per 100 mGy (95% CI)
Overall 827 0.04 (−0.35, 0.43) 737 0.03 (−0.35, 0.42)
Sex
 Male 309 0.07 (−0.38, 0.53) 291 0.06 (−0.39, 0.52)
 Female 518 −0.13 (−0.49, 0.23) 446 -0.13 (−0.68, 0.43)
Job title
 Radiologic technologist 232 0.01 (−0.49, 0.52) 218 0.01 (−0.50, 0.51)
 Radiologist 21 0.01 (−0.84, 0.85) 21 0.002 (−0.84, 0.84)
 Dentist 119 −0.05 (−4.57, 4.48) 115 −0.06 (−4.57, 4.45)
 Dental hygienist 101 −1.16 (−4.53, 2.21) 82 −1.14 (−5.22, 2.94)
 Nurse 82 −0.11 (−1.87, 1.65) 61 −0.11 (−1.85, 1.64)
 Doctor 150 −0.003 (−1.20, 1.19) 141 −0.01 (−1.20, 1.19)
 Others 122 0.03 (−0.69, 0.74) 99 0.03 (−0.69, 0.75)
Type of medical facility
 Hospital 291 0.02 (−0.47, 0.50) 251 −0.004 (−0.48, 0.48)
 Clinic 229 0.004 (−0.67, 0.68) 218 −0.01 (−0.68, 0.66)
 Others 307 0.07 (−0.76, 0.91) 268 0.09 (−0.74, 0.93)
Year of birth
  < 1960 94 0.004 (−0.46, 0.47) 91 0.004 (−0.47, 0.47)
 1960–1969 259 0.001 (−0.73, 0.73) 248 −0.002 (−0.73, 0.72)
 1970–1979 321 0.03 (−0.95, 1.01) 279 0.03 (−0.96, 1.03)
  ≥ 1980 153 −0.16 (−2.40, 2.08) 119 −0.16 (−2.46, 2.15)
Year of entry
 1996–1999 280 0.03 (−0.37, 0.42) 274 0.02 (−0.37, 0.42)
 2000–2004 239 −0.02 (−1.28, 1.23) 218 −0.001 (−1.29, 1.28)
 2005–2011 308 −0.86 (−3.42, 1.71) 245 −0.87 (−3.45, 1.72)
Age at baseline, years
  < 25 167 0.14 (−1.38, 1.65) 149 0.16 (−1.40, 1.71)
 25–29 227 −0.10 (−0.88, 0.69) 195 −0.10 (−0.88, 0.69)
 30–39 295 −0.02 (−0.71, 0.67) 264 −0.03 (−0.71, 0.66)
  ≥ 40 138 0.04 (−0.49, 0.57) 129 0.04 (−0.49, 0.57)
Duration of employment, years
  < 1 90 −0.45 (−7.12, 6.23) 0
 1–4 294 −0.08 (−2.12, 1.96) 294 −0.18 (−1.64, 1.28)
 5–9 210 −0.07 (−1.44, 1.30) 210 −0.17 (−1.44, 1.11)
  ≥ 10 233 0.02 (−0.38, 0.41) 233 0.03 (−0.37, 0.43)
  1. aAdjusted for sex, attained age (< 25, 5-year intervals from age 25 to 84, ≥85 years) and calendar time (< 2000, 2000–2004, 2005–2009, ≥2010)
  2. CI confidence interval, ERR excess relative risk