TABLE 2.

WTC Occupations and Exposure Characteristics of the Patient Population (n = 168)

		Immigrants
	US Born	Polish	Latinos
Occupational group
Laborers	13.0%	86.4%	90.0%
First responders	32.2%	2.3%	0.6%
Construction trade	15.1%	4.5%	5.9%
Volunteer	10.9%	0%	1.1%
Other	30.8%	6.8%	2.4%
Presence at the WTC site
On 9/11 or 9/12/2001	77.4%	50.0%	12.7%
Exposed to 9/11 dust cloud	30.1%	8.3%	1.6%
9/13-21/2001	80.6%	58.3%	73.0%
9/22-28/2001	68.8%	58.3%	76.2%
9/29-10/5/2001	64.5%	91.7%	87.3%
On or after 10/6/2001	72.0%	100%	96.8%
Exposure duration (wks)	15.3 ± 14.4	20.3 ± 9.0	21.7 ± 17.5