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Causality and temporality in the study of short-term effects of air pollution on health.

Identifieur interne : 000671 ( Main/Exploration ); précédent : 000670; suivant : 000672

Causality and temporality in the study of short-term effects of air pollution on health.

Auteurs : M J Campbell [Royaume-Uni] ; A. Tobías

Source :

RBID : pubmed:10817124

Descripteurs français

English descriptors

Abstract

BACKGROUND

The relationship between air pollution and health is usually analysed by time series analysis. However, temporality (i.e. looking to see whether the cause precedes the effect) is rarely examined in detail.

METHODS

Models were fitted to daily levels of black smoke, nitrogen dioxide, sulphur dioxide, ozone and mortality from Barcelona 1986-1995 to account for seasonality, environmental temperature, days of the week and influenza epidemics. Cross-correlations of the residuals were plotted for different lags.

RESULTS

Clear evidence of a temporal relationship between mortality and air pollution found for all four pollutants in that changes in the pollutant preceded changes in mortality, implying causality. However the pattern of dependence was different for each pollutant.

CONCLUSION

The cross-correlation plot is a useful tool in the analysis of air pollution time series.


DOI: 10.1093/ije/29.2.271
PubMed: 10817124


Affiliations:


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<nlm:affiliation>University of Sheffield, UK. m.j.campbell@sheffield.ac.uk</nlm:affiliation>
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<term>Mortality (MeSH)</term>
<term>Retrospective Studies (MeSH)</term>
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<term>Facteurs temps (MeSH)</term>
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<term>Modèles statistiques (MeSH)</term>
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<b>BACKGROUND</b>
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<p>The relationship between air pollution and health is usually analysed by time series analysis. However, temporality (i.e. looking to see whether the cause precedes the effect) is rarely examined in detail.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>METHODS</b>
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<p>Models were fitted to daily levels of black smoke, nitrogen dioxide, sulphur dioxide, ozone and mortality from Barcelona 1986-1995 to account for seasonality, environmental temperature, days of the week and influenza epidemics. Cross-correlations of the residuals were plotted for different lags.</p>
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<b>RESULTS</b>
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<p>Clear evidence of a temporal relationship between mortality and air pollution found for all four pollutants in that changes in the pollutant preceded changes in mortality, implying causality. However the pattern of dependence was different for each pollutant.</p>
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<b>CONCLUSION</b>
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<p>The cross-correlation plot is a useful tool in the analysis of air pollution time series.</p>
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