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Shape of radiation dose response relationship for Ischaemic heart disease mortality and its interpretation: analysis of the National Registry for Radiation Workers (NRRW) cohort.
Journal of Radiological Protection : Official Journal of the Society for Radiological Protection 2024 March 27
Statistically significant increases in ischemic heart disease (IHD) mortality with cumulative occupational external radiation dose were observed in the National Registry for Radiation Workers (NRRW) cohort. There were 174541 subjects in the NRRW cohort. The start of follow up was 1955, and the end of the follow-up for each worker was chosen as the earliest date of death or emigration, their 85th birthday or December 31, 2011. The dose-response relationship showed a downward curvature at a higher dose level > 0.4 Sv with the overall shape of the dose-response relationship best described by a linear-quadratic model. The smaller risk at dose > 0.4 Sv appears to be primarily associated with workers who started employment at a younger age (< 30 years old) and those who were employed for more than 30 years. We modelled the dose response by age-at-first exposure. For the age-at-first exposure of 30+ years old, a linear dose-response was the best fit. For age-at-first exposure <30 years old, there was no evidence of excess risk of ischemic heart disease mortality for radiation doses below 0.1 Sv or above 0.4 Sv, excess risk was only observed for doses between 0.1-0.4 Sv. For this age-at-first exposure group, it was also found that the doses they received when they were less than 35 years old or greater than 50 years old did not contribute to any increased IHD risk.
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