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Table 4 Association between survey participation and enrollees’ health conditions

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

  Poor/fair health at wave 2 PTSD > =44 at wave 2 Recurrent LRS b at wave 2
Wave 3 drop-outs (N = 9,868) AORa 95% CI AORa 95% CI AORa 95% CI
  1.4*** 1.3, 1.4 1.2*** 1.2, 1.3 1.2*** 1.1, 1.3
Three-wave participants (n = 36,252) reference
  Poor/fair health at wave 3 PTSD > =44 at wave 3 Recurrent LRS b at wave 3
Wave 3 drop-ins (N = 6,682) AORa 95% CI AORa 95% CI AORa 95% CI
  1.3*** 1.2, 1.4 1.4*** 1.3, 1.5 1.2*** 1.1, 1.3
Three-wave participants (n = 36,252) reference
  1. Abbreviations: AOR, adjusted odds ratio; CI, confidence interval; PTSD, probable posttraumatic stress disorder; LRS, lower respiratory symptoms.
  2. *P < 0.05; **P < 0.01; ***P < 0.0001.
  3. aAdjusted for study recruitment source, sex, age, race, income, eligibility group, education, survey mode, and wave 1 exposure.
  4. bEnrollees who reported at least 1 of 3 symptoms - shortness of breath, persistent cough, or wheezing - for the first time at wave 1 (i.e., post-9/11) and for 8 or more days (consecutive or nonconsecutive) in the last 30 days at wave 2 or wave 3.