Int J Health Geogr - The effect of spatial aggregation on performance when mapping a risk of disease.

Tópicos

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Resumo

CKGROUND: Spatial data on cases are available either in point form (e.g. longitude/latitude), or aggregated by an administrative region (e.g. zip code or census tract). Statistical methods for spatial data may accommodate either form of data, however the spatial aggregation can affect their performance. Previous work has studied the effect of spatial aggregation on cluster detection methods. Here we consider geographic health data at different levels of spatial resolution, to study the effect of spatial aggregation on disease mapping performance in locating subregions of increased disease risk.METHODS: We implemented a non-parametric disease distance-based mapping (DBM) method to produce a smooth map from spatially aggregated childhood leukaemia data. We then simulated spatial data under controlled conditions to study the effect of spatial aggregation on its performance. We used an evaluation method based on ROC curves to compare performance of DBM across different geographic scales.RESULTS: Application of DBM to the leukaemia data illustrates the method as a useful visualization tool. Spatial aggregation produced expected degradation of disease mapping performance. Characteristics of this degradation, however, varied depending on the interaction between the geographic extent of the higher risk area and the level of aggregation. For example, higher risk areas dispersed across several units did not suffer as greatly from aggregation. The choice of centroids also had an impact on the resulting mapping.CONCLUSIONS: DBM can be implemented for continuous and discrete spatial data, but the resulting mapping can lose accuracy in the second setting. Investigation of the simulations suggests a complex relationship between performance loss, geographic extent of spatial disturbances and centroid locations. Aggregation of spatial data destroys information and thus impedes efforts to monitor these data for spatial disturbances. The effect of spatial aggregation on cluster detection, disease mapping, and other useful methods in spatial epidemiology is complex and deserves further study.

Resumo Limpo

ckground spatial data case avail either point form eg longitudelatitud aggreg administr region eg zip code census tract statist method spatial data may accommod either form data howev spatial aggreg can affect perform previous work studi effect spatial aggreg cluster detect method consid geograph health data differ level spatial resolut studi effect spatial aggreg diseas map perform locat subregion increas diseas riskmethod implement nonparametr diseas distancebas map dbm method produc smooth map spatial aggreg childhood leukaemia data simul spatial data control condit studi effect spatial aggreg perform use evalu method base roc curv compar perform dbm across differ geograph scalesresult applic dbm leukaemia data illustr method use visual tool spatial aggreg produc expect degrad diseas map perform characterist degrad howev vari depend interact geograph extent higher risk area level aggreg exampl higher risk area dispers across sever unit suffer great aggreg choic centroid also impact result mappingconclus dbm can implement continu discret spatial data result map can lose accuraci second set investig simul suggest complex relationship perform loss geograph extent spatial disturb centroid locat aggreg spatial data destroy inform thus imped effort monitor data spatial disturb effect spatial aggreg cluster detect diseas map use method spatial epidemiolog complex deserv studi

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