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. Author manuscript; available in PMC: 2016 Jul 12.
Published in final edited form as: N Engl J Med. 2010 Apr 8;362(14):1263–1272. doi: 10.1056/NEJMoa0910087

Figure 4. Abnormal Lung Function in Firefighters and Emergency-Medical-Services (EMS) Personnel Who Had Never Smoked and Who Worked at the World Trade Center Site during the First 2 Weeks after 9/11.

Figure 4

Shown are data for nonsmoking Fire Department of New York City personnel who worked at the World Trade Center site during the first 2 weeks after the attack of September 11, 2001 (9/11). The proportions of firefighters and EMS workers who had a forced expiratory volume in 1 second (FEV1) under the lower limit of the normal range (i.e., the lowest 5th percentile of a reference population6) or less than 70% of the predicted value are indicated. Data are shown for white workers and black workers only, since reliable predicted normal values were not available for other groups. Median numbers of spirometric measurements per 6-month interval were 1822 for fire-fighters and 291 for EMS workers.