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Table 1 Study population characteristics 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
Sex     
Male 61.1 58.8 1.1*** 1.1, 1.2
Female 38.9 41.2 reference reference
Age at wave 1 interview, year    
<=24 3.5 6.7 2.2*** 1.9, 2.5
25 - 44 46.2 56.0 1.8*** 1.7, 2.0
45 - 64 45.9 32.7 1.0 0.9, 1.1
> = 65 4.3 4.7 reference reference
Race     
Non-Hispanic black 10.2 15.0 1.8*** 1.7, 1.9
Hispanic 11.6 16.2 1.5*** 1.4, 1.6
Asian 5.8 9.4 16*** 1.4, 1.7
Other-multi-racial 3.5 5.4 1.3*** 1.2, 1.5
Non-Hispanic white 68.8 54.0 reference reference
Total household Income in 2002, $    
<25,000 9.1 15.2 1.3*** 1.3, 1.4
25,000- < 50,000 19.7 25.1 1.1** 1.1, 1.2
50,000- < 75,000 21.9 19.8 0.9 0.9, 1.0
75,000- < 150,000 37.1 29.0 0.9** 0.9, 1.0
> = 150,000 12.3 10.9 reference reference
Education     
High school and below 22.6 29.2 1.4*** 1.3, 1.5
College 57.0 54.6 1.2*** 1.1, 1.2
Post-graduate 20.4 16.2 reference reference
Study recruitment source    
List-identified 26.3 36.7 1.7*** 1.7, 1.8
Self-identified 73.7 63.4 reference reference
Eligibility group     
Lower Manhattan resident 14.0 20.0 1.6*** 1.5, 1.7
Lower Manhattan area worker 34.0 33.1 1.2*** 1.1, 1.2
Passersby on 9/11 5.1 6.1 1.3*** 1.2, 1.4
Otherb 0.2 0.2 0.8 0.5, 1.2
Rescue/recovery worker 46.6 40.7 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 2.
  4. bStudents and school staff in public schools south of Canal Street on 9/11/2001.
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