Table 5.

Risk of Self-Reported Myocardial Infarction/Fatal Coronary Heart Disease According to Maximum Total Hydrocarbon Exposure and Time Since Initiating Oil Spill Work (n = 23,923), Gulf Long-Term Follow-up Study, United States, 2010–2016

Max THC Exposure, ppm	Time Since Initiating Oil Spill Work
	12 Months		24 Months		36 Months		48 Months
	Riska	RD	Riska	RD	Riska	RD	Riska	RD
<0.30	0.002	Referent	0.005	Referent	0.007	Referent	0.009	Referent
0.30–0.99	0.004	0.002	0.010	0.005	0.012	0.005	0.016	0.007
1.00–2.99	0.004	0.002	0.008	0.003	0.012	0.005	0.016	0.007
≥3.00	0.006	0.004	0.010	0.005	0.013	0.006	0.019	0.010

Abbreviations: ppm, parts per million; RD, risk difference; THC, total hydrocarbons.

^a Risk estimates accounted for confounders (age, sex, education, smoking, and residential proximity to the spill) and predictors of censoring (age, education, ethnicity, smoking, cleanup work duration, and residential proximity to the spill) using inverse-probability weights.