Most studies of World Trade Center (WTC)-exposed populations have reported the occurrence of various conditions thought to present more commonly as a consequence of exposure to the WTC disaster site. Because a non-WTC-exposed comparison group has not yet been identified, the most critical question remains unanswered: to what extent are apparent disease and symptom excesses associated with WTC exposure? This 5-year project will address this question through the ongoing study inclusion of an established comparison cohort of non-NYC-based urban firefighters who were not exposed to the disaster site to estimate disease risk in WTC-exposed compared with risk in unexposed firefighters.
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