Estimating risk of emergency room visits for asthma from personal versus fixed site measurements of NO2

Journal article


Weichenthal, Scott, Bélisle, Patrick, Lavigne, Eric, Villeneuve, Paul J., Wheeler, Amanda, Xu, Xiaohong and Joseph, Lawrence. (2015) Estimating risk of emergency room visits for asthma from personal versus fixed site measurements of NO2. Environmental Research. 137, pp. 323 - 328. https://doi.org/10.1016/j.envres.2015.01.006
AuthorsWeichenthal, Scott, Bélisle, Patrick, Lavigne, Eric, Villeneuve, Paul J., Wheeler, Amanda, Xu, Xiaohong and Joseph, Lawrence
Abstract

Background: We examined the impact of data source and exposure measurement error for ambient NO2 on risk estimates derived from a case-crossover study of emergency room visits for asthma in Windsor, Canada between 2002 and 2009. Methods: Paired personal and fixed-site NO2 data were available from an independent population (47 children and 48 adults) in Windsor between 2005 and 2006. We used linear regression to estimate the relationship and measurement error variance induced between fixed site and personal measurements of NO2, and through a series of simulations, evaluated the potential for a Bayesian model to adjust for this change in scale and measurement error. Finally, we re-analyzed data from the previous case-crossover study adjusting for the estimated change in slope and measurement error. Results: Correlations between paired NO2 measurements were weak (R2≤0.08) and slopes were far from unity (0.0029≤β≤0.30). Adjusting the previous case-crossover analysis suggested a much stronger association between personal NO2 (per 1 ppb) (Odds Ratio (OR)=1.276, 95% Credible Interval (CrI): 1.034, 1.569) and emergency room visits for asthma among children relative to the fixed-site estimate (OR=1.024, 95% CrI 1.004–1.045). Conclusions: Our findings suggest that risk estimates based on fixed-site NO2concentrations may differ substantially from estimates based on personal exposures if the change in scale and/or measurement error is large. In practice, one must always keep the scale being used in mind when interpreting risk estimates and not assume that coefficients for ambient concentrations reflect risks at the personal level.

Keywordsexposure measurement error; NO2; asthma; case-crossover studies
Year2015
JournalEnvironmental Research
Journal citation137, pp. 323 - 328
PublisherAcademic Press
ISSN0013-9351
Digital Object Identifier (DOI)https://doi.org/10.1016/j.envres.2015.01.006
Scopus EID2-s2.0-84922511638
Open accessOpen access
Page range323 - 328
Research GroupMary MacKillop Institute for Health Research
Publisher's version
License
Place of publicationUnited States of America
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