Exposure Characteristics
Job and Exposure Characteristics of GuLF STUDY Workers by Study Event
07/30/18
| Full Cohort N = 24,937 |
Home Visit N = 8,968 |
Follow-Up N = 16,814 |
Clinical Exam N = 2,873 |
|||||
|---|---|---|---|---|---|---|---|---|
| Characteristic | N | % | N | % | N | % | N | % |
| Work Affiliation | ||||||||
| BP contractor | 17,030 | 68.3 | 7,494 | 83.6 | 11,466 | 68.2 | 2,418 | 84.2 |
| BP employee | 622 | 2.5 | 232 | 2.6 | 410 | 2.4 | 78 | 2.7 |
| Federal government | 4,363 | 17.5 | 352 | 3.9 | 3,326 | 19.8 | 60 | 2.1 |
| Local or State government | 635 | 2.5 | 207 | 2.3 | 464 | 2.8 | 74 | 2.6 |
| Volunteer | 384 | 1.5 | 180 | 2.0 | 265 | 1.6 | 69 | 2.4 |
| Other | 1,029 | 4.1 | 385 | 4.3 | 677 | 4.0 | 134 | 4.7 |
| DK/Refused | 874 | 3.5 | 118 | 1.3 | 206 | 1.2 | 40 | 1.4 |
| Number of Jobs/Tasks | ||||||||
| 1 | 4,965 | 19.9 | 913 | 10.2 | 3,346 | 19.9 | 263 | 9.2 |
| 2-5 | 6,295 | 25.2 | 1,719 | 19.2 | 4,132 | 24.6 | 532 | 18.5 |
| 6-10 | 5,863 | 23.5 | 2,428 | 27.1 | 4,066 | 24.2 | 749 | 26.1 |
| ≥ 11 | 7,814 | 31.3 | 3,908 | 43.6 | 5,270 | 31.3 | 1,329 | 46.3 |
| Duration of Work | ||||||||
| ≤ 14 Days | 1,463 | 5.9 | 445 | 5.0 | 988 | 5.9 | 145 | 5.0 |
| 15 - 180 Days | 18,122 | 72.7 | 6,278 | 70.0 | 12,103 | 72.0 | 1,907 | 66.4 |
| > 180 Days | 5,352 | 21.5 | 2,245 | 25.0 | 3,723 | 22.1 | 821 | 28.6 |
| Work Timing1 | ||||||||
| Only Before Capping | 4,194 | 16.8 | 1,338 | 14.9 | 2,765 | 16.4 | 418 | 14.5 |
| Only After Capping | 3,355 | 13.5 | 1,043 | 11.6 | 2,378 | 14.1 | 291 | 10.1 |
| Before and After Capping | 17,388 | 69.7 | 6,587 | 73.5 | 11,671 | 69.4 | 2,164 | 75.3 |
| Still Working at Time of Interview | ||||||||
| 650 | 2.6 | 246 | 2.7 | 482 | 2.9 | 110 | 3.8 | |
| Job Class2 | ||||||||
| Response | 4,479 | 18.0 | 1,680 | 18.7 | 3,048 | 18.1 | 513 | 17.9 |
| Support of Operations | 4,371 | 17.5 | 1,888 | 21.1 | 2,946 | 17.5 | 675 | 23.5 |
| Clean-up on Water | 4,328 | 17.4 | 1,319 | 14.7 | 2,620 | 15.6 | 479 | 16.7 |
| Decontamination | 3,561 | 14.3 | 1,794 | 20.0 | 2,455 | 14.6 | 568 | 19.8 |
| Clean-up on Land | 3,634 | 14.6 | 1,462 | 16.3 | 2,520 | 15.0 | 411 | 14.3 |
| Administrative Support | 4,564 | 18.3 | 825 | 9.2 | 3,225 | 19.2 | 227 | 7.9 |
| Potentially Exposed to Dispersants3 | ||||||||
| Yes | 2,355 | 9.4 | 1,156 | 12.9 | 1,582 | 9.4 | 370 | 12.9 |
| No | 21,138 | 84.8 | 7,417 | 82.7 | 14,611 | 86.9 | 2,362 | 82.2 |
| Unknown | 1,444 | 5.8 | 395 | 4.4 | 621 | 3.7 | 141 | 4.9 |
| Potentially Exposed to Burning/Flaring | ||||||||
| Yes | 2,439 | 9.8 | 841 | 9.4 | 1,473 | 8.8 | 242 | 8.4 |
| No | 22,004 | 88.2 | 7,964 | 88.8 | 14,990 | 89.2 | 2,578 | 89.7 |
| Unknown | 494 | 2.0 | 163 | 1.8 | 351 | 2.1 | 53 | 1.8 |
| Burning/Flaring Level3 | ||||||||
| None | 21,706 | 87.0 | 7,964 | 88.8 | 14,990 | 89.2 | 2,578 | 89.7 |
| Low | 52 | 0.2 | 18 | 0.2 | 32 | 0.2 | 4 | 0.1 |
| Medium | 1,883 | 7.6 | 727 | 8.1 | 1,276 | 7.6 | 214 | 7.4 |
| High | 240 | 1.0 | 96 | 1.1 | 165 | 1.0 | 24 | 0.8 |
| Unknown | 1,056 | 4.2 | 163 | 1.8 | 351 | 2.1 | 53 | 1.8 |
| Daily Maximum THC Ordinal Level4 | ||||||||
| THC ≤ 0.29 ppm | 5,458 | 21.9 | 1,264 | 14.1 | 3,864 | 23.0 | 413 | 14.4 |
| THC 0.3 - 0.9 ppm | 8,216 | 32.9 | 3,348 | 37.3 | 5,519 | 32.8 | 946 | 32.9 |
| THC 1.0 - 2.99 ppm | 7,791 | 31.2 | 3,014 | 33.6 | 5,094 | 30.3 | 1,113 | 38.7 |
| THC ≥ 3ppm | 3,445 | 13.8 | 1,331 | 14.8 | 2,313 | 13.8 | 395 | 13.7 |
| Unknown5 | 27 | 0.1 | 11 | 0.1 | 24 | 0.1 | 6 | 0.2 |
1Work relative to initial capping of well on July 15, 2010.
2Some people reported jobs or tasks in more than one job-class. Assignments shown are hierarchical in the same order as listed.
3Not assessed for Vietnamese-only speaking participants (N = 562 workers)
4Daily Maximum Ordinal THC Level is the daily maximum THC in ppm across all jobs across all time periods.
5Exposure levels for those who began work after 06/30/2011 not estimated.