Table 3b.
Associations between hierarchical job classes, total hydrocarbons, and incident asthma among workers (N=19,018)
| Exposure | Asthma cases n(%) | Risk RatioCRUDE (95% CI) | Risk RatioMODEL1 (95% CI) | Risk RatioMODEL2 (95% CI) |
|---|---|---|---|---|
| Hierarchical job class | ||||
| Support | 47(5) | Referent | Referent | Referent |
| Land cleanup | 122(12) | 3.43(2.47,4.79) | 2.40(1.72,3.35) | 2.41(1.73,3.37) |
| Decontamination | 136(14) | 4.08(2.94,5.66) | 3.13(2.26,4.35) | 3.15(2.27,4.36) |
| Water cleanup | 152(16) | 2.22(1.60,3.06) | 2.39(1.74,3.30) | 2.42(1.75,3.34) |
| Operations | 368(37) | 5.15(3.81,6.95) | 4.29(3.16,5.82) | 4.29(3.16,5.82) |
| Response | 158(16) | 5.23(3.80,7.21) | 4.44(3.22,6.11) | 3.80(2.42,5.99) |
| Total hydrocarbons (Cum1max; ppm-days) | ||||
| Quintile 1 | 97(10) | Referent | Referent | Referent |
| Quintile 2 | 160(16) | 1.65(1.29,2.11) | 1.48(1.16,1.89) | 1.50(1.17,1.92) |
| Quintile 3 | 184(19) | 1.90(1.49,2.42) | 1.74(1.36,2.21) | 1.76(1.38,2.25) |
| Quintile 4 | 230(23) | 2.37(1.88,2.99) | 2.18(1.72,2.75) | 2.15(1.70,2.72) |
| Quintile 5 | 312(32) | 3.22(2.57,4.02) | 2.99(2.37,3.76) | 2.95(2.33,3.74) |
Model 1: age, gender, race, ethnicity, smoking status, pack-years, previous oil spill cleanup work, previous oil industry experience, education
Model 2: Model 1+ burning/flaring oil/gas (ordinal categories)