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Letters
December 2, 2009

Asthma Following the 2001 World Trade Center Attack

JAMA. 2009;302(21):2319-2320. doi:10.1001/jama.2009.1746

To the Editor: In their longitudinal study, Dr Brackbill and colleagues1 used the World Trade Center Health Registry to follow up on previous studies of the incidence of new asthma in this large cohort exposed to toxic gases, fumes, and dust. Based on 46 322 (68%) of the participants questioned in 2003-2004 who were requestioned in 2006-2007, they reported a 10.2% frequency of new asthma in the years after the September 11, 2001, attack, higher than the estimated 2002 annual national incidence of 0.5%.2

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