| .Excess relative risk for solid cancer mortality during prolonged exposure to high-background natural radiation in Yangjiang area of China[J].Chinese Journal of Radiological Medicine and Protection,2002,22(1):57 |
| Excess relative risk for solid cancer mortality during prolonged exposure to high-background natural radiation in Yangjiang area of China |
| Received:August 13, 2001 |
| DOI： |
| KeyWords:Cohort study Cancer Low-dose Dose estimation Excess risk |
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| Abstract:: |
| Objective To estimate the excess relative risk for solid cancer associated with chronically exposure to high-background natural radiation in Yangjiang area of China. Methods Based on hamlet-specific environmental doses and sex-and age-specific occupancy factors, we calculated cumulative doses for each cohort member.Assuming a linear dose response relationship and using cancer mortality data for the period 1979-1995 and Poisson model, we estimated the excess relative risk(EER)for solid cancer. Results The ERR per Sv of all solid cancer is estimated to be -0.11(95% CI, -0.67, 0.69 to 95%).The corresponding figures for cancers of liver, nasopharynx, lungs and stomach are -0.99(-1.60, 0.10), 0.10(-1.21, 3.28), -0.68(-1.58, 1.66) and -0.27(-1.37, 2.69)respectively. Conclusion The association between ERR of solid cancer and dose can not be found. |
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