Spat Spatiotemporal Epidemiol - A comparison between self-reported and GIS-based proxies of residential exposure to environmental pollution in a case-control study on lung cancer.


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In epidemiological studies both questionnaire results and GIS modeling have been used to assess exposure to environmental risk factors. Nevertheless, few studies have used both these techniques to evaluate the degree of agreement between different exposure assessment methodologies. As part of a case-control study on lung cancer, we present a comparison between self-reported and GIS-derived proxies of residential exposure to environmental pollution. 649 subjects were asked to fill out a questionnaire and give information about residential history and perceived exposure. Using GIS, for each residence we evaluated land use patterns, proximity to major roads and exposure to industrial pollution. We then compared the GIS exposure-index values among groups created on the basis of questionnaire responses. Our results showed a relatively high agreement between the two methods. Although none of these methods is the "exposure gold standard", understanding similarities, weaknesses and strengths of each method is essential to strengthen epidemiological evidence.

Resumo Limpo

epidemiolog studi questionnair result gis model use assess exposur environment risk factor nevertheless studi use techniqu evalu degre agreement differ exposur assess methodolog part casecontrol studi lung cancer present comparison selfreport gisderiv proxi residenti exposur environment pollut subject ask fill questionnair give inform residenti histori perceiv exposur use gis resid evalu land use pattern proxim major road exposur industri pollut compar gis exposureindex valu among group creat basi questionnair respons result show relat high agreement two method although none method exposur gold standard understand similar weak strength method essenti strengthen epidemiolog evid

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