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Table 2 Standardized incidence ratios and relative risks for thyroid cancer by occupational history and sex among South Korean medical radiation workers, 1996–2015

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

  Male Female
Cases SIR (95% CI) RRa (95% CI) Cases SIR (95% CI) RRa (95% CI)
Total 309 1.72 (1.53, 1.91) 518 1.18 (1.08, 1.28)
Job title
 Radiologic technologist 91 1.73 (1.37, 2.08) Ref (1.00) 141 1.60 (1.34, 1.87) Ref (1.00)
 Radiologist 11 2.33 (0.95, 3.71) 1.42 (0.75, 2.69) 10 1.07 (0.41, 1.73) 0.63 (0.33, 1.22)
 Dentist 68 1.60 (1.22, 1.98) 1.06 (0.76, 1.47) 51 1.05 (0.76, 1.34) 0.65 (0.47, 0.91)
 Dental hygienist 0 101 0.88 (0.71, 1.05) 0.59 (0.45, 0.76)
 Nurse 2 2.24 (−, 5.35) 1.34 (0.33, 5.44) 80 1.17 (0.91, 1.43) 0.77 (0.58, 1.01)
 Doctor 97 1.73 (1.38, 2.07) 1.11 (0.81, 1.51) 53 1.48 (1.08, 1.88) 0.93 (0.67, 1.30)
 Others 40 1.79 (1.23, 2.34) 0.98 (0.67, 1.43) 82 1.11 (0.87, 1.35) 0.69 (0.52, 0.91)
Type of medical facility
 Hospital 101 1.81 (1.46, 2.16) Ref (1.00) 190 1.42 (1.21, 1.62) Ref (1.00)
 Clinic 118 1.72 (1.41, 2.02) 1.01 (0.77, 1.34) 111 1.30 (1.06, 1.54) 0.91 (0.72, 1.15)
 Others 90 1.65 (1.31, 1.98) 1.02 (0.76, 1.37) 217 0.99 (0.86, 1.12) 0.72 (0.59, 0.87)
Year of birth
  < 1960 68 1.88 (1.43, 2.32) 1.25 (0.46, 3.35) 26 1.45 (0.89, 2.01) 2.01 (0.89, 4.56)
 1960–1969 131 1.77 (1.47, 2.08) 1.17 (0.54, 2.51) 128 1.25 (1.03, 1.47) 1.10 (0.66, 1.84)
 1970–1979 77 1.36 (1.06, 1.66) 0.94 (0.53, 1.68) 244 1.17 (1.03, 1.32) 1.15 (0.83, 1.60)
  ≥ 1980 33 2.60 (1.71, 3.49) Ref (1.00) 120 1.09 (0.89, 1.28) Ref (1.00)
Year of entry
 1996–1999 126 1.85 (1.53, 2.18) 0.93 (0.69, 1.24) 154 1.32 (1.11, 1.53) 1.11 (0.87, 1.41)
 2000–2004 77 1.42 (1.10, 1.73) 0.73 (0.54, 0.98) 162 1.19 (1.01, 1.37) 1.06 (0.86, 1.32)
 2005–2011 106 1.86 (1.50, 2.21) Ref (1.00) 202 1.09 (0.94, 1.24) Ref (1.00)
Age at baseline, years
  < 25 18 1.75 (0.94, 2.56) Ref (1.00) 149 1.15 (0.97, 1.34) Ref (1.00)
 25–29 70 1.69 (1.30, 2.09) 1.66 (0.90, 3.05) 157 1.19 (1.00, 1.38) 1.10 (0.86, 1.40)
 30–39 136 1.73 (1.44, 2.02) 2.06 (1.06, 4.00) 159 1.17 (0.99, 1.35) 1.00 (0.75, 1.35)
  ≥ 40 85 1.73 (1.36, 2.10) 1.90 (0.90, 4.02) 53 1.30 (0.95, 1.64) 1.20 (0.77, 1.88)
Duration of employment, years
  < 1 18 1.36 (0.73, 1.99) Ref (1.00) 72 1.19 (0.92, 1.47) Ref (1.00)
 1–4 90 1.90 (1.51, 2.29) 1.41 (0.85, 2.35) 204 1.08 (0.93, 1.22) 0.90 (0.69, 1.18)
 5–9 81 1.58 (1.23, 1.92) 1.15 (0.68, 1.93) 129 1.17 (0.97, 1.37) 0.94 (0.70, 1.26)
  ≥ 10 120 1.78 (1.46, 2.10) 1.25 (0.75, 2.10) 113 1.44 (1.18, 1.71) 1.11 (0.81, 1.53)
  1. aAdjusted for attained age (< 25, 5-year intervals from age 25 to 84, ≥85 years) and calendar time (< 2000, 2000–2004, 2005–2009, ≥2010)
  2. SIR standardized incidence ratio, CI confidence interval, Ref. reference, RR relative risk