Table IV.
Unadjusted and Adjusted* Hazard Ratios for Association between World Trade Center-related Environmental Exposure and All-Cause Mortality among World Trade Center Health Program Rescue and Recovery Worker Participants, 2002 – 2011 (n=26,634)
| Exposure Metric | Unadjusted (n=322 deaths) | Adjusted* (n=304 deaths) | ||
|---|---|---|---|---|
| HR | 95% CI | HR | 95% CI | |
| Model with 1-variable Exposure Metric | ||||
| Exposure index | ||||
| Low | 1.00 | 1.00 | ||
| Intermediate | 0.95 | 0.69 – 1.31 | 1.09 | 0.77 – 1.52 |
| High | 0.94 | 0.63 – 1.38 | 1.27 | 0.84 – 1.90 |
| Very High | 0.79 | 0.38 – 1.61 | 1.22 | 0.57 – 2.63 |
| p-trend=0.57 | p-trend=0.25 | |||
| Model with 3-variable Exposure Metric | ||||
| Dust cloud exposure/arrival time | ||||
| No dust/late arrival (9/15 or later) | 1.00 | 1.00 | ||
| No dust/early arrival (9/11 – 9/14) | 0.91 | 0.69 – 1.22 | 1.04 | 0.77 – 1.40 |
| Some exposure to dust cloud | 0.65 | 0.39 – 1.09 | 0.85 | 0.49 – 1.47 |
| Significant exposure to dust cloud | 0.65 | 0.45 – 0.94 | 0.85 | 0.58 – 1.24 |
| Directly in dust cloud | 0.81 | 0.59 – 1.12 | 1.13 | 0.81 – 1.59 |
| p-trend=0.05 | p-trend=0.88 | |||
| Duration of work (days) | ||||
| 1 – 16 | 1.00 | 1.00 | ||
| 17 – 51 | 1.03 | 0.75 – 1.41 | 1.24 | 0.89 – 1.73 |
| 52 – 111 | 0.86 | 0.62 – 1.19 | 1.08 | 0.77 – 1.52 |
| ≥112 | 1.05 | 0.77 – 1.42 | 1.07 | 0.78 – 1.48 |
| p-trend=0.99 | p-trend=0.86 | |||
| Location of work | ||||
| Not on debris pile | 1.00 | 1.00 | ||
| On debris pile | 1.04 | 0.82 – 1.31 | 1.09 | 0.85 – 1.39 |
*
Adjusted for age on 9/11/2001, occupation pre-9/11/2001, sex, race/ethnicity, year of enrollment, and smoking and BMI at enrollment
HR = hazard ratio; CI = confidence interval; BMI = body mass index