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Table 2 The SMR according to colon doses and selected cancers: Okayama, both sexes, aged 0–34 years at time of bomb, 1971–1990

From: Hiroshima survivors exposed to very low doses of A-bomb primary radiation showed a high risk for cancers

Cause of death Dose categories (Sv)
<0.005 (very low) 0.005–0.1 (low) 0.1 (high) Total
Oa Eb SMRc (95% CI) P valued Oa Eb SMRc (95% CI) P valued Oa Eb SMRc (95% CI) P valued Oa Eb SMRc (95% CI) P valued
Males
  All deaths 682 560.8 1.216 (1.128–1.309) 0.000 715 641.3 1.115 (1.037–1.199) 0.004 403 318.7 1.265 (1.146–1.390) 0.000 1,800 1520.7 1.184 (1.130–1.239) 0.000
  All cancers 242 181.5 1.334 (1.179–1.511) 0.000 263 205.9 1.277 (1.132–1.436) 0.000 161 102.9 1.565 (1.340–1.814) 0.000 666 490.3 1.358 (1.260–1.464) 0.000
  Leukemia 16 5.1 3.139 (1.981–4.948) 0.000 9 5.9 1.527 (0.799–2.627) 0.283 9 2.9 3.066 (1.598–5.254) 0.001 34 13.9 2.441 (1.741–3.310) 0.000
  Solid cancers 218 169.8 1.284 (1.123–1.458) 0.000 250 192.6 1.298 (1.145–1.461) 0.000 147 96.2 1.528 (1.303–1.788) 0.000 615 458.6 1.341 (1.238–1.448) 0.000
  Stomach 65 50.7 1.281 (1.001–1.602) 0.045 73 57.6 1.268 (1.002–1.563) 0.042 33 28.8 1.145 (0.812–1.558) 0.492 171 137.1 1.247 (1.075–1.442) 0.004
  Colon 12 7.6 1.574 (0.865–2.460) 0.160 12 8.7 1.379 (0.769–2.187) 0.343 9 4.4 2.056 (1.199–3.941) 0.049 33 20.7 1.594 (1.121–2.151) 0.010
  Liver 55 23.0 2.395 (1.839–3.063) 0.000 61 26.5 2.305 (1.828–2.970) 0.000 48 13.0 3.702 (2.788–4.808) 0.000 164 62.4 2.629 (2.271–3.065) 0.000
  Lung 30 31.0 0.969 (0.679–1.344) 0.932 38 34.7 1.094 (0.792–1.457) 0.637 15 17.5 0.855 (0.508–1.305) 0.625 83 83.2 0.997 (0.807–1.226) 0.979
Females
  All deaths 701 610.0 1.149 (1.067–1.236) 0.000 745 687.3 1.084 (1.009–1.164) 0.029 519 382.8 1.356 (1.244–1.474) 0.000 1,965 1680.1 1.170 (1.119–1.222) 0.000
  All cancers 244 224.2 1.088 (0.961–1.230) 0.186 286 249.1 1.148 (1.023–1.285) 0.021 241 139.8 1.724 (1.518–1.945) 0.000 771 613.1 1.258 (1.172–1.348) 0.000
  Leukemia 6 5.6 1.069 (0.469–1.945) 0.962 6 6.3 0.952 (0.469–1.945) 0.937 12 3.5 3.456 (2.307–6.561) 0.000 24 15.4 1.560 (1.079–2.301) 0.039
  Solid cancers 228 211.5 1.078 (0.949–1.225) 0.256 269 234.8 1.146 (1.016–1.285) 0.028 226 131.8 1.714 (1.503–1.942) 0.000 723 578.1 1.251 (1.163–1.344) 0.000
  Stomach 43 59.5 0.722 (0.533–0.946) 0.038 56 66.0 0.849 (0.654–1.085) 0.243 57 37.1 1.537 (1.190–1.965) 0.001 156 162.6 0.959 (0.818–1.113) 0.604
  Colon 14 14.1 0.994 (0.600–1.588) 0.913 13 15.9 0.818 (0.478–1.310) 0.548 13 8.8 1.473 (0.850–2.329) 0.216 40 38.8 1.031 (0.754–1.367) 0.912
  Liver 30 11.3 2.651 (1.915–3.786) 0.000 29 12.5 2.317 (1.557–3.113) 0.000 16 7.1 2.269 (1.415–3.534) 0.001 75 30.9 2.429 (1.932–2.997) 0.000
  Lung 21 19.1 1.100 (0.726–1.626) 0.746 38 21.5 1.771 (1.321–2.429) 0.001 27 11.9 2.265 (1.550–3.175) 0.000 86 52.5 1.639 (1.340–2.021) 0.000
  Female breast 21 14.3 1.466 (0.985–2.206) 0.103 22 15.5 1.422 (0.972–2.140) 0.125 30 8.8 3.420 (2.340–4.628) 0.000 73 38.6 1.893 (1.490–2.325) 0.000
  Uterus 27 15.4 1.755 (1.240–2.540) 0.005 35 17.0 2.061 (1.483–2.795) 0.000 21 9.6 2.177 (1.379–3.089) 0.000 83 42.0 1.975 (1.595–2.423) 0.000
  1. aObserved number of deaths (person-years)
  2. bExpected number of deaths (person-years)
  3. cRisk among Hiroshima survivors in LSS relative to population of Okayama prefecture
  4. dChi-square test