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Table 2 Wave 1 health and disaster exposure and their associations with dropping-out of wave 3

From: Evaluation of non-response bias in a cohort study of World Trade Center terrorist attack survivors

  Wave 3 participants Wave 3 non-participants Likelihood of dropping out of wave 3
  (N = 42,934) % (N = 24,736) % AOR a 95% CI
Health at wave 1 (Baseline)    
New or worsening respiratory symptoms since 9/11b     
Yes 68.0 65.9 1.0* 0.9, 1.0
No 32.1 34.2 reference reference
PTSD > =44     
Yes 15.2 17.9 1.1*** 1.1, 1.2
No 84.8 82.1 reference reference
Chronic diseases diagnosed since 9/11c     
Yes 10.9 10.2 1.0 0.9, 1.0
No 89.2 89.8 reference reference
Disaster exposure     
Witnessed traumatic or horrific event on 9/11/01     
Yes 37.1 37.6 1.0 1.0, 1.1
No 62.9 62.4 reference reference
Sustained injury on 9/11/01     
Yes 13.7 12.5 1.0 0.9, 1.0
No 86.3 87.5 reference reference
Caught in dust cloud on 9/11/01    
Yes 52.1 51.1 1.0 0.9, 1.0
No 47.9 49.0 reference reference
  1. Abbreviations: AOR, adjusted odds ratio; CI, confidence interval.
  2. *P < 0.05; **P < 0.01; ***P < 0.0001.
  3. aAdjusted for all factors listed in this table and in Table 1.
  4. bEnrollees had developed one or more new or worsening respiratory symptoms (persistent cough, shortness of breath, wheezing, sinus problems, and throat irritation) since 9/11.
  5. cEnrollees reported physician diagnosis of one or more of the diseases (angina, asthma, hypertension, coronary heart disease, heart attack or other heart problems, stroke, emphysema, diabetes, and cancer) since 9/11.
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