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A Case-Crossover Study of Ambient Particulate Matter and Cardiovascular and Respiratory Medical Encounters Among US Military Personnel Deployed to Southwest Asia

Abraham, Joseph H. ScD, MS; Baird, Coleen P. MD, MPH

Section Editor(s): Teichman, Ron MD, MPH; Guest Editor

Journal of Occupational & Environmental Medicine:
doi: 10.1097/JOM.0b013e318253356c
Original Articles

Objective: To evaluate the impact of ambient particulate matter (PM) on acute cardiorespiratory morbidity among US military personnel in southwest Asia.

Methods: We linked ambient PM data collected between December 2005 and June 2007 with personnel, medical, and meteorological data. We implemented a case-crossover analysis to estimate base-specific associations and pooled those estimates using meta-analytic methods.

Results: The adjusted odds ratios for a 10-μg/m3 increase in ambient PM2.5 and a qualifying medical encounter were 0.92 (95% confidence interval [CI]: 0.77 to 1.11) and 1.01 (95% CI: 0.95 to 1.07) for the current (lag_0) and previous (lag_1) days. The estimates for a 10-μg/m3 increase in PM10 were 0.99 (95% CI: 0.97 to 1.03) at lag_0, and 1.00 (95% CI: 0.97 to 1.02) at lag_1.

Conclusions: No statistically significant associations between PM and cardiorespiratory outcomes were observed in this young, relatively healthy, deployed military population.

Author Information

From the US Army Public Health Command, Aberdeen Proving Ground, Md.

Address correspondence to: Joseph H. Abraham, ScD, MS, Environmental Medicine Program, US Army Public Health Command (Provisional), 5158 Black Hawk Rd, Aberdeen Proving Ground, MD 21010 mail to:

This work was supported by the US Department of Defense.

The opinions expressed in the article represent those of the authors and do not represent those of the Department of Defense or the Department of the Army.

The authors declare no conflict of interest.

©2012The American College of Occupational and Environmental Medicine