Skip to main content

Table 6 Modification of the associations between oil spill exposures and nonfatal MI by residential proximity to the oil spill. GuLF STUDY, 2010–2013

From: Deepwater Horizon oil spill exposures and nonfatal myocardial infarction in the GuLF STUDY

 

MI cases/ total na

RRb (95% CI)

MI cases/ total na

RRb (95% CI)

LRTe P-value*

 

Among workers and non-workers (N = 31,109)

 

Direct/indirect proximity (n = 18,984)

Away from the spill (n = 12,125)

Worked on clean-up

 Yes

106/13801

1.16 (0.79, 1.70)

43/9598

1.32 (0.62, 2.81)

0.81

 No

32/4686

ref

8/2186

ref

 

Among clean-up workers and responders only (n = 24,375)

 

Direct/indirect proximity (n = 14,140)

Away from the spill (n = 9866)

Maximum exposure jobc

 Response Work

15/2439

0.83 (0.37, 1.87)

5/1872

0.58 (0.20, 1.66)

0.31

 Operations Work

29/2836

1.35 (0.65, 2.80)

10/1378

1.06 (0.42, 2.68)

 Clean-up on Water

17/2400

0.82 (0.40, 1.82)

3/1206

0.46 (0.12, 1.68)

 Decontamination

25/2366

1.88 (0.89, 3.95)

8/1077

1.33 (0.50, 3.49)

 Clean-up on Land

11/2128

0.87 (0.37, 2.06)

7/1360

1.02 (0.38, 2.71)

 Administration Support

10/1633

ref

10/2705

ref

Work durationd

  > 180 days

31/3392

1.50 (0.93, 2.40)

7/1770

0.97 (0.40, 2.33)

0.08

 91–180 days

37/4866

1.10 (0.71, 1.72)

20/3191

1.39 (0.73, 2.65)

 1–90 days

40/5545

ref

17/4638

ref

Ever had to stop work due to heatc

 Yes

56/5116

2.10 (1.42, 3.10)

14/2104

1.53 (0.80, 2.95)

0.56

 No

48/7898

ref

23/5945

ref

Worked near burning oilc

 Yes

10/1094

1.26 (0.65, 2.43)

3/978

0.78 (0.28, 2.20)

0.54

 No

96/12707

ref

40/8620

ref

Maximum overall THC exposure

  ≥ 3.00 ppm

17/1819

1.99 (0.88, 4.51)

7/1504

1.27 (0.47, 3.38)

0.48

 1.00–2.99 ppm

40/5018

1.42 (0.68, 2.94)

9/2165

0.92 (0.36, 2.38)

 0.30–0.99 ppm

41/4800

1.92 (0.93, 3.97)

18/2875

1.54 (0.68, 3.49)

  < 0.30 ppm

8/2151

ref

9/3041

ref

  1. Residential proximity to the spill is defined as living in or adjacent to a county or parish with coastline that was oiled during the spill
  2. aNumber of observations included in the fully adjusted model, by exposure status
  3. bRisk ratios (RR) adjusting for age, gender, BMI, education, and smoking
  4. cModels for the associations of stopping work due to heat with MI and working near burning oil with MI adjust for duration of clean-up work in addition to the confounders age, gender, BMI, education, and smoking
  5. dFor analyses of work duration stratified by residential proximity to the spill, the variable was recoded into 3 categories (1–90 days, 91–180 days, > 180 days) due to insufficient numbers of cases in the shorter work duration categories
  6. eLRT Likelihood Ratio Test. The LRT was used to assess statistical significance of an interaction term between the modifier variable and the main exposure variable
  7. *Alpha = 0.05