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Table 3 Comparison of health conditions at follow-up surveys among drop-ins/outs and three-wave participants

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 a at wave 2 (%)
Wave 2 participants (n = 46,120) Wave 3 drop-outs (n = 9,868) 24.7 21.6 22.4
  Three-wave participants (n = 36,252) 19.4 18.9 20.6
   Poor/fair health at wave 3 (%) PTSD > =44 at wave 3 (%) Recurrent LRS at wave 3 (%)
Wave 3 participants (n = 42,934) Wave 3 drop-ins (n = 6,682) 33.7 22.4 18.6
  Three-wave participants (n = 36,252) 25.9 16.5 16.4
  1. Abbreviations: PTSD, probable posttraumatic stress disorder; LRS, lower respiratory symptoms.
  2. aEnrollees 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.
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