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Residential Radon and Lung Cancer among Never-Smokers in Sweden

Frédéric Lagarde, Gösta Axelsson, Lena Damber, Hans Mellander, Fredrik Nyberg and Göran Pershagen
Epidemiology
Vol. 12, No. 4 (Jul., 2001), pp. 396-404
Stable URL: http://www.jstor.org/stable/3703373
Page Count: 9
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Residential Radon and Lung Cancer among Never-Smokers in Sweden
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Abstract

In this study, we attempted to reduce existing uncertainty about the relative risk of lung cancer from residential radon exposure among never-smokers. Comprehensive measurements of domestic radon were performed for 258 never-smoking lung cancer cases and 487 never-smoking controls from five Swedish case-control studies. With additional never-smokers from a previous case-control study of lung cancer and residential radon exposure in Sweden, a total of 436 never-smoking lung cancer cases diagnosed in Sweden between 1980 and 1995 and 1,649 never-smoking controls were included. The relative risks (with 95% confidence intervals in parentheses) of lung cancer in relation to categories of time-weighted average domestic radon concentration during three decades, delimited by cutpoints at 50, 80, and 140 Bq m-3, were 1.08 (0.8-1.5), 1.18 (0.9-1.6), and 1.44 (1.0-2.1), respectively, with average radon concentrations below 50 Bq m-3 used as reference category and with adjustment for other risk factors. The data suggested that among never-smokers residential radon exposure may be more harmful for those exposed to environmental tobacco smoke. Overall, an excess relative risk of 10% per 100 Bq m-3 average radon concentration was estimated, which is similar to the summary effect estimate for all subjects in the main residential radon studies to date.

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