Combining data sources: Air pollution and asthma consultations in 59 general practices throughout England and Wales - A case study - ARCHIVED

Surveys and statistical programs – Documentation: 11-522-X19990015688


The geographical and temporal relationship between outdoor air pollution and asthma was examined by linking together data from multiple sources. These included the administrative records of 59 general practices widely dispersed across England and Wales for half a million patients and all their consultations for asthma, supplemented by a socio-economic interview survey. Postcode enabled linkage with: (i) computed local road density; (ii) emission estimates of sulphur dioxide and nitrogen dioxides, (iii) measured/interpolated concentration of black smoke, sulphur dioxide, nitrogen dioxide and other pollutants at practice level. Parallel Poisson time series analysis took into account between-practice variations to examine daily correlations in practices close to air quality monitoring stations. Preliminary analyses show small and generally non-significant geographical associations between consultation rates and pollution markers. The methodological issues relevant to combining such data, and the interpretation of these results will be discussed.

Issue Number: 1999001
Author(s): Armstrong, Barbara; Charlton, J.; Fletcher, T.; Stevenson, S.; Wilkinson, Peter
FormatRelease dateMore information
CD-ROMMarch 2, 2000