Table 9.
Comparison of radiation related cancer risks observed in various study populations
| Study population and age at exposure | Site of cancer | Period of follow-up | Quantity estimated | Estimate (95% CI)* |
|---|---|---|---|---|
| Present study | ||||
| 0-19 years | Leukaemias and myelodysplasias | Study members followed for 9.5 years on average, after exclusion of first year | ERR per mGy of bone marrow dose | 0.039 (0.014 to 0.070) |
| Leukaemia, excluding myelodysplasias | Study members followed for 7.3 years on average, after exclusion of first five years | ERR per mGy of bone marrow dose | 0.035 (0.000 to 0.077) | |
| Brain cancer after brain CT | Study members followed for 7.3 years on average, after exclusion of first five years | ERR per mGy of brain dose | 0.021 (0.014 to 0.029) | |
| Brain cancer after brain CT | Study members followed for 5.5 years on average, after exclusion of first 10 years | ERR per mGy of brain dose | 0.015 (0.007 to 0.026) | |
| All cancers other than brain cancer after brain CT | Study members followed for 9.5 years on average, after exclusion of first year | ERR per mSv of effective dose | 0.035 (0.026 to 0.042) | |
| Solid cancers other than brain cancer after brain CT | Study members followed for 5.5 years on average, after exclusion of first 10 years | ERR per mSv of effective dose | 0.027 ( 0.017 to 0.037) | |
| Young people exposed to CT scans in the UK in 1985-2008 | ||||
| 0-21 years | Leukaemias and myelodysplasias12 | Study members followed for 9.6 years on average, after exclusion of first two years | ERR per mGy of bone marrow dose | 0.036 (0.005 to 0.120) |
| Brain cancer12 | Study members followed for 6.7 years on average, after exclusion of first five years | ERR per mGy of brain dose | 0.023 (0.010 to 0.049) | |
| Life Span Study of survivors of atomic bombings in Japan in 1945 | ||||
| 0-19 years | Leukaemias, excluding myelodysplasias18 | 1950-60 | ERR per mGy of bone marrow dose | 0.045 (0.016 to 0.188) |
| Brain cancer40 | 1958-65 | ERR per mSv of brain dose | 0.006 (0.000 to 0.064) | |
| Solid cancers other than brain cancer†40 | 1958-65 | ERR per mSv of colon dose | 0.003 (0.002 to 0.006) | |
ERR=Excess rate ratio.
*For male and female members combined.
†M Little (National Cancer Institute), personal communication, March 2013.