World Trade Center Health Registry: Sample Building and Denominator Estimation
The World Trade Center Health Registry (WTCHR) is a database for following people who were exposed to the disaster of September 11, 2001 (9/11). Hundreds of thousands of people were exposed to the immense cloud of dust and debris, the indoor dust, the fumes from persistent fires,
and the mental trauma of the terrorist attacks on the WTC on 9/11. The purpose of the WTCHR is to evaluate the potential short and long term physical and mental health effects of the disaster. It was conceived as an imperative public health response to document and assess the potential
impact on physical and mental health resulting from the WTC disaster on large and diverse populations. It is a collaborative scientific effort by the New York City Department of Health and Mental Hygiene (NYCDOHMH), Agency for Toxic Substances and Disease Registry (ATSDR), and external scientific, labor, and community advisors. Funding has been provided
by the Federal Emergency Management Agency (FEMA) and ATSDR. WTCHR sample building and baseline data collection activities were conducted by RTI International.