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An association between oil spill clean-up work and cardiovascular disease
Mihye Lee1, Myung-Sook Park2, Hae-Kwan Cheong3
1St. Luke's International University School of Public Health, Tokyo, Japan.
Background:
In December 2007, Taean, South Korea, experienced the largest oil spill in Korean history. After about 10 years of follow-up, we evaluated the long-term effect of the disaster on the cardiovascular health of residents and clean-up workers/volunteers.
Objective:
We examined the relationship between the duration of oil clean-up work and the risk of incident angina and myocardial infarction (MI).
Methods:
We used data from a prospective cohort study, the Health Effects Research of Oil Spill (HEROS); we included adult cohort members free from cardiovascular disease who completed at least the first two surveys (n = 1737). At baseline, members reported the number of days they participated in oil clean-up work; during the subsequent surveys, they reported newly diagnosed cases of angina or MI. We fitted a time-varying interval-censored proportional hazard model, controlling for age, sex, body mass index, smoking status, monthly household income, and distance from the affected seashore to residence.
Results:
The risk of incident angina or MI was greater in those with more than 15 days' exposure; those with 15-59 days showed a hazard ratio (HR) of 1.34 (95% confidence interval [CI]: 0.87, 2.06) those with 60-179 days had an HR of 1.31 (0.95, 1.79), and those worked longest (180 or more days) showed the strongest association with a HR of 1.75 (95% CI: 1.17, 2.61).
Conclusion:
We found that a greater duration of clean-up work was associated with an increased risk of incident angina or MI.
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