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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