Lung cancer and residency--a case-referent study on the possible impact of of exposure to radon and its daughters in dwellings.

Abstract
In view of the well-known urban-rural difference in lung cancer rates, remaining also after standardization for smoking, low levels of Rn and its daughters in dwellings might be of etiologic importance to this disease. A case-referent (case-control) study was undertaken in a rural area; it considered residency in wooden houses (assumed to be associated with low-level exposure to Rn and its daughters), mixed type houses (medium exposure) and stone houses (high-level exposure) among cases of lung cancer and referents (controls). An increased risk of lung cancer among residents in mixed type and stone houses was found. Additional studies are highly desirable to confirm or refute these findings, which, if valid, mean increasing lung cancer hazards caused by a decrease in ventilation in future energy saving unless special measures are undertaken to reduce Rn daughters in dwellings.

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