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This Article Full Text Full Text (PDF) All Versions of this Article: AJPH.2007.124768v1 99/1/65    most recent Submit a response View Shopping Cart Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Murphy, J. Search for Related Content PubMed PubMed Citation Articles by Murphy, J. Related Collections Epidemiology Injury/Emergency Care/Violence Surveys Urban Health

Joe Murphy, MA

The author is with RTI International, Chicago, IL.

Correspondence: Requests for reprints should be sent to Joe Murphy, MA, RTI International, 230 W Monroe St, Suite 2100, Chicago, IL 60606 (e-mail: jmurphy{at}rti.org).

I applied the capture–recapture method to estimate the World Trade Center tower population at the time of the September 11, 2001, terrorist attacks. Available lists helped identify 8965 survivors and 2152 confirmed casualties. The capture–recapture model suggested that an additional 4435 survivors were present, putting the total count of all present at 15 552 (95% confidence interval = 15 216, 15 897). An accurate estimate represents the potential number at risk for trauma as a result of direct exposure to the events of the day.