Table 3.
Marginal Hazard Ratios of the Association of Maximum Total Hydrocarbon Exposure and Self-Reported Myocardial Infarction/Fatal Coronary Heart Disease, Gulf Long-Term Follow-up Study, United States, 2010–2016
| Max THC Exposure, ppm | Total Cases (n = 307) | Total No.a (n = 23,520) | HRb | 95% CI |
|---|---|---|---|---|
| No censoring weights | ||||
| <0.30 | 41 | 5,246 | 1.00 | Referent |
| 0.30–0.99 | 105 | 7,719 | 1.60 | 1.07, 2.41 |
| 1.00–2.99 | 114 | 7,209 | 1.45 | 0.96, 2.18 |
| ≥3.00 | 47 | 3,346 | 1.70 | 1.05, 2.74 |
| IP-censoring weightedc | ||||
| <0.30 | 41 | 5,215 | 1.00 | Referent |
| 0.30–0.99 | 105 | 7,682 | 1.66 | 1.09, 2.53 |
| 1.00–2.99 | 114 | 7,178 | 1.62 | 1.06, 2.47 |
| ≥3.00 | 47 | 3,334 | 1.81 | 1.11, 2.95 |
Abbreviations: CI, confidence interval; HR, hazard ratio; IP, inverse probability; ppm, parts per million; THC, total hydrocarbons.
a Total n for models without censoring weights is where maximum THC exposure, sex, age, smoking, education, and residential proximity to the spill are nonmissing; total n for models with censoring weights is where ethnicity is also nonmissing.
b Models controlled for sex, age, smoking, education, and residential proximity to the oil spill using IP-exposure weights.
c Censoring weights accounted for age, ethnicity, education, residential proximity to the oil spill, smoking, and maximum total hydrocarbon exposure.