Table 1. Demographics of Cohort.
| Date/Event | Baseline Cohort | Susceptible Cases | Sub-Cohort Controls | p | |
| N | 801 | 70 | 123 | ||
| WTC Exposure, N(%) | High | 197(25%) | 18(26%) | 21(17%) | 0.151 |
| Intermediate | 604(75.4%) | 52(74%) | 102(83%) | ||
| 9/11 to PFT, Months * | MME | 2.7(2–4) | 2.7(2–4) | 2.5(2–3) | 0.145 |
| SPE | 33.8(25–57) | 32.6(21–53) | 35.5(26–55) | 0.327 | |
| BMI, kg/m2 * | MME | 28.0(26–30) | 29.0(27–31) | 28.0(26–31) | 0.106 |
| SPE | 28.9(27–31) | 29.6(27–34) | 29.0(27–31) | 0.018 | |
| Change | 0.8(–0.1–1.8) | 1.1(0–2.3) | 0.6(–0.4–1.7) | 0.003 | |
| Years of Service * | 9/11/01 | 13(7–19) | 15(8–18) | 14(7–18) | 0.907 |
| Age * | 9/11/01 | 40(36–45) | 40(36–45) | 42(37–46) | 0.764 |
*
Median (IQR).
WTC, World Trade Center; MME, Medical Monitoring Exam; SPE, Subspecialty Pulmonary Exam; PFT, Pulmonary Function Test; BMI, Body Mass Index.