TABLE 2.

Capture–Recapture Model Estimates of the World Trade Center Tower Population on September 11, 2001

Model	Akaike's Information Criterion, No.	Estimate of Survivors, No. (95% CI)	Estimate of Survivors and Casualties, No.
Independent (no interactions)	324.5	12 646 (12 417, 12 914)	14 798
SI × BL interaction	273.5	12 412 (12 167, 12 655)	14 564
SI × PA interaction	220.0	11 010 (10 743, 11 315)	13 162
BL × PA interaction	103.1	13 699 (13 350, 14 049)	15 851
SI × BL, SI × PA interactions	98.8	10 517 (10 301, 10 763)	12 669
SI × BL, BL × PA interactions	75.1	13 400 (13 064, 13 745)	15 552
SI × PA, BL × PA interactions	104.6	14 161 (13 066, 15 642)	16 313

Note. CI = confidence interval; SI = self-identified list source; BL = business list source; PA = Port Authority list source.