S. Darby et al., A parallel analysis of individual and ecological data on residential radonand lung cancer in south-west England, J ROY STA A, 164, 2001, pp. 193-203
Citations number
28
Categorie Soggetti
Economics
Journal title
JOURNAL OF THE ROYAL STATISTICAL SOCIETY SERIES A-STATISTICS IN SOCIETY
Parallel individual and ecological analyses of data on residential radon ha
ve been performed using information on cases of lung cancer and population
controls from a recent study in south-west England. For the individual anal
ysis the overall results indicated that the relative risk of lung cancer at
100 Bq m(-3) compared with at 0 Bq m(-3) was 1.12 (95% confidence interval
(0.99, 1.27)) after adjusting for age, sex, smoking, county of residence a
nd social class. In the ecological analysis substantial bias in the estimat
ed effect of radon was present for one of the two counties involved unless
an additional variable, urban-rural status, was included in the model, alth
ough this variable was not an important confounder in the individual level
analysis. Most of the methods that have been recommended for overcoming the
limitations of ecological studies would not in practice have proved useful
in identifying this variable as an appreciable source of bias.