Table 2a.
Characteristics of overall analysis cohort and sub-groups by maximum THC group.
| Characteristics | Total (n=2,816) | <0.30 ppm (n=406) | 0.30–0.99 ppm (n=935) | 1.0–2.99 ppm (n=1090) | ≥3 ppm (n=388) |
|---|---|---|---|---|---|
| Age, average years±SD | 44.91±12.97 | 45.73±12.90 | 44.11±12.75 | 46.23±13.22 | 42.29+12.32 |
| Sex, female(%) | 631 (22.4) | 171 (42.1) | 295 (31.6) | 122 (11.2) | 43 (11.1) |
| Race, n(%) | |||||
| Black | 1125 (40.0) | 179 (44.4) | 454 (48.6) | 297 (27.3) | 195 (50.4) |
| Other | 234 (8.3) | 25 (6.2) | 69 (7.4) | 110 (10.1) | 30 (7.8) |
| White | 1454 (51.7) | 199 (49.4) | 412 (44.1) | 681 (62.6) | 162 (41.9) |
| Education, n(%) | |||||
| Less than high school | 608 (21.6) | 55 (13.5) | 176 (18.8) | 270 (24.8) | 107 (27.6) |
| High school diploma | 978 (34.7) | 126 (31.0) | 343 (36.7) | 362 (33.2) | 147 (37.9) |
| Some college | 849 (30.1) | 123 (30.3) | 300 (32.1) | 328 (30.1) | 98 (25.3) |
| College grad | 383 (13.6) | 102 (25.1) | 116 (12.4) | 129 (11.8) | 36 (9.3) |
| Smoking status, n(%) | |||||
| Never daily smoker | 934 (33.1) | 180 (44.3) | 305 (32.6) | 355 (32.6) | 94 (24.2) |
| Former daily smoker | 770 (27.3) | 105 (25.9) | 247 (26.4) | 316 (29.0) | 102 (26.3) |
| Current daily smoker | 1115 (39.6) | 121 (29.8) | 383 (41.0) | 419 (38.4) | 192 (49.5) |
| Tobacco use within 2 hours before exam, n(%) | 786 (41.7) | 89 (39.4) | 272 (43.2) | 303 (41.2) | 122 (41.6) |
| Reported passive smoke exposure, n(%) | 545 (28.6) | 70 (24.5) | 190 (29.8) | 210 (29.6) | 75 (27.3) |
| Binge drinkers, n(%)* | 285 (13.9) | 30 (9.8) | 77 (11.6) | 132 (17.2) | 46 (14.8) |
| Consumed alcohol within 2 hours before exam, n(%) | 7 (0.3) | 0 (0.0) | 3 (0.4) | 4 (0.4) | 0 (0.0) |
| Consumed caffeine within 2 hours before exam, n(%) | 835 (29.9) | 117 (29.1) | 291 (31.6) | 341 (31.5) | 86 (22.4) |
| Sleep the night before exam, mean hours±SD | 6.32±1.91 | 6.33±1.89 | 6.36±1.85 | 6.33±1.95 | 6.15±1.97 |
| Proportion of tasks wearing respirators, mean±SD | 0.09±0.20 | 0.14±0.34 | 0.10±0.20 | 0.08±0.18 | 0.08±0.19 |
| Oil spill response and cleanup class, n(%)† | |||||
| Response | 506 (17.9) | 1 (0.2) | 20 (2.1) | 199 (18.3) | 286 (73.7) |
| Operations support | 658 (23.3) | 1 (0.2) | 75 (8.0) | 498 (45.7) | 84 (21.6) |
| Water cleanup | 469 (16.6) | 1 (0.2) | 116 (12.4) | 348 (31.9) | 4 (1.0) |
| Decontamination | 558 (19.8) | 20 (4.9) | 484 (51.8) | 40 (3.7) | 14 (3.6) |
| Land cleanup | 405 (14.4) | 189 (46.6) | 213 (22.8) | 3 (0.3) | 0 (0.0) |
| Administrative support | 223 (7.9) | 194 (47.8) | 27 (2.9) | 2 (0.2) | 0 (0.0) |
| Completed entire BARS exam, n(%) | 2776 (98.5) | 403 (99.3) | 922 (98.6) | 1069 (98.1) | 382 (98.5) |
*
Reported ≥5 drinks on one occasion ≥12 times during the year before the clinical exam
†
Response: Stopped the oil release, flared oil/gas, applied dispersant; Support of operations: Handled oily waste; Cleanup on water: Cleanup of oil on water; Decontamination: Decontaminated vessels, equipment, personnel, wildlife; Cleanup on land: Beach cleanup; Administrative: Cooking, security, administrative, various other support jobs. See Supplementary Table 1 for more details.