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Table 3 Projected number of cases of 9/11-related conditions among the ~ 409,000 persons estimated to have been eligible for World Trade Center Health Registry enrollment a, b

From: Persistent mental and physical health impact of exposure to the September 11, 2001 World Trade Center terrorist attacks

   Asthma GERD PTSD Depression One or more 9/11-associated conditions d
Participant group Total Exposed c Lower bound Mid-point Upper bound Lower bound Mid-point Upper bound Lower bound Mid-point Upper bound Lower bound Mid-point Upper bound Lower bound Mid-point Upper bound
Rescue/recovery workers 91,469 7121 10,281 19,275 12,146 17,085 29,659 7683 11,061 15,347 9573 13,645 15,445 29,406 38,001 50,388
Community enrollees 318,023 20,406 29,657 44,117 31,186 44,593 56,270 23,076 33,402 45,125 26,960 38,795 47,340 95,076 124,068 151,471
All 409,492 27,527 39,938 63,391 43,333 61,678 85,929 30,759 46,762 62,862 36,532 52,440 62,784 124,483 162,070 201,859
  1. GERD: gastroesophageal reflux disease
  2. PTSD: posttraumatic stress disorder
  3. aBurden estimates are rounded to the nearest integer
  4. bMidpoint estimate is the product of the percent ill among list-identified persons and the total population exposed. Lower bound estimate adjusts for the possibility that even among listed persons, those ill were 50% more likely to enroll in the WTCHR. The lower bound estimate is the product of the total population exposed and the ratio of A to B, where (A) is the number of list-identified persons who were ill and (B) is the sum of the number of list-identified persons who were healthy × 1.5 and the number of list-identified persons who were ill. Upper bound estimate is the product of the percent ill among self-identified persons and the total population exposed
  5. cEstimates from Murphy J, Brackbill RM, Thalji L, et al. Measuring and maximizing coverage in the World Trade Center Health Registry. Stat Med 2007;26:1688–1701
  6. dConditions included were asthma, GERD, PTSD, and depression