Cataract is one of the major morbidities in the U.S. population and it has long been appreciated that high and acutely delivered radiation doses of 1 Gy or more can induce cataract. Some more recent studies, in particular those of the U.S. Radiologic Technologists, have suggested that cataract may be induced by much lower, chronically delivered doses of ionizing radiation. It is well recognized that dosimetric measurement error can substantially alter the shape of the radiation dose-response relationship and thus, the derived study risk estimates, and can also inflate the variance of the estimates. In the current study, we evaluate the impact of uncertainties in eye-lens absorbed doses on the estimated risk of cataract in the U.S. Radiologic Technologists' Monte Carlo Dosimetry System, using both absolute and relative risk models. Among 11,345 cases we show that the inflation in the standard error for the excess relative risk (ERR) is generally modest, at most approximately 20% of the unadjusted standard error, depending on the model used for the baseline risk. The largest adjustment results from use of relative risk models, so that the ERR/Gy and its 95% confidence intervals change from 1.085 (0.645, 1.525) to 1.085 (0.558, 1.612) after adjustment. However, the inflation in the standard error of the excess absolute risk (EAR) coefficient is generally minimal, at most approximately 0.04% of the standard error.
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August 2020
Research Article|
June 18 2020
Analysis of Cataract in Relationship to Occupational Radiation Dose Accounting for Dosimetric Uncertainties in a Cohort of U.S. Radiologic Technologists
Mark P. Little;
Mark P. Little
1,
a Radiation Epidemiology Branch
1 Address for correspondence: Radiation Epidemiology Branch, National Cancer Institute, Division of Cancer Epidemiology and Genetics, NCI Shady Grove, 9609 Medical Center Drive, Bethesda, MD 20892-9778; email: mark.little@nih.gov.
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Ankur Patel;
Ankur Patel
a Radiation Epidemiology Branch
b Biostatistics Branch, National Cancer Institute, Division of Cancer Epidemiology and Genetics, Bethesda, Maryland 20892-9778
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Nobuyuki Hamada;
Nobuyuki Hamada
c Radiation Safety Research Center, Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), Tokyo 201-8511, Japan
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Paul Albert
Paul Albert
b Biostatistics Branch, National Cancer Institute, Division of Cancer Epidemiology and Genetics, Bethesda, Maryland 20892-9778
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Radiat Res (2020) 194 (2): 153–161.
Article history
Received:
September 26 2019
Accepted:
May 07 2020
Citation
Mark P. Little, Ankur Patel, Nobuyuki Hamada, Paul Albert; Analysis of Cataract in Relationship to Occupational Radiation Dose Accounting for Dosimetric Uncertainties in a Cohort of U.S. Radiologic Technologists. Radiat Res 1 August 2020; 194 (2): 153–161. doi: https://doi.org/10.1667/RR15529.1
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