Parish classification or dwelling coordinate for exposure assessment in environmental epidemiology - a comparative study using Geographical Information System

The Science of the Total Environment
Martin TondelBodil Persson

Abstract

Two previous epidemiological studies on the incidence of total malignancies in Sweden after the Chernobyl accident have shown consistently increased risks. The first study used an analogue map on (137)Cs from 1986 to classify individuals in terms of the parish they lived in. In the second study, dwelling coordinates were matched to a digital map from the year 2000 to assess the individual exposure. To establish the accuracy of the exposure assessment using the larger unit of parish, instead of coordinates, we decided to compare the methods. On the analogue map eleven isolines on the deposition of (137)Cs (kBq/m(2)) were used to classify all individuals in each of the 450 parishes. Using the digital map, by contrast, each dwelling with its inhabitants could be matched to (137)Cs deposition at a coordinate level. A population-weighted average of (137)Cs deposition was calculated for each parish. In total, 1,126,960 individuals and 450 parishes were included and analysed into six different exposure categories. Using the new parish exposure index, 111 out of the 450 parishes were reclassified as a result of the increased resolution of the digital map (86 parishes) or unequal distribution of the population compared with the depositi...Continue Reading

References

Mar 1, 1989·International Journal of Epidemiology·S Greenland, H Morgenstern
Feb 20, 2002·Health & Place·Scott OrfordGeorge Davey Smith
May 14, 2004·International Journal of Circumpolar Health·Mika J Rytkönen
Nov 18, 2004·Journal of Epidemiology and Community Health·Martin TondelOlav Axelson
Jan 20, 2006·American Journal of Industrial Medicine·Martin TondelBodil Persson

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Citations

Feb 1, 2013·Community Dentistry and Oral Epidemiology·Amid I IsmailAndrea Zandona

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