Katherine Wheeler,1 Wendy McKelvey,1 Lorna Thorpe,1 Megan Perrin,1 James Cone,1 Daniel Kass,1 Mark Farfel,1 Pauline Thomas,2 and Robert Brackbill3
1New York City Department of Health and Mental Hygiene, New York, New York, USA; 2New Jersey Medical School, UMDNJ, Newark, New Jersey, USA; 3Agency for Toxic Substances and Disease Registry, Atlanta, Georgia, USA
Background: Studies have consistently documented declines in respiratory health after 11 September 2001 (9/11) among surviving first responders and other World Trade Center (WTC) rescue, recovery, and clean-up workers.
Objectives: The goal of this study was to describe the risk of newly diagnosed asthma among WTC site workers and volunteers and to characterize its association with WTC site exposures.
Methods: We analyzed 20032004 interview data from the World Trade Center Health Registry for workers who did not have asthma before 9/11 (n = 25,748) , estimating the risk of newly diagnosed asthma and its associations with WTC work history, including mask or respirator use.
Results: Newly diagnosed asthma was reported by 926 workers (3.6%) . Earlier arrival and longer duration of work were significant risk factors, with independent dose responses (p < 0.001) , as were exposure to the dust cloud and pile work. Among workers who arrived on 11 September, longer delays in the initial use of masks or respirators were associated with increased risk of asthma ; adjusted odds ratios ranged from 1.63 [95% confidence interval (CI) , 1.032.56) for 1 day of delay to 3.44 (95% CI, 1.438.25) for 1640 weeks delay.
Conclusions: The rate of self-reported newly diagnosed asthma was high in the study population and significantly associated with increased exposure to the WTC disaster site. Although we could not distinguish appropriate respiratory protection from inappropriate, we observed a moderate protective effect of mask or respirator use. The findings underscore the need for adequate and timely distribution of appropriate protective equipment and the enforcement of its use when other methods of controlling respiratory exposures are not feasible.
Key words: asthma, disaster, masks, respirators, World Trade Center, workers. Environ Health Perspect 115:15841590 (2007) . doi:10.1289/ehp.10248 available via http://dx.doi.org/ [Online 27 August 2007]
Environmental Health Perspectives Volume 115, Number 11, November 2007