Skip to main content

Table 5 Modification of the associations between oil spill exposures and nonfatal MI among workers and non-workers by smoking status. GuLF STUDY, 2010–2013

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

  MI cases/na RRb (95% CI) MI cases/na RRb (95% CI) LRTe P-value*
  Among workers and non-workers without prevalent MI (N = 31,109)  
Ever smoker (n = 15,861) Never smoker (n = 15,016)
Worked on clean-up
 Yes 100/12043 0.99 (0.67, 1.47) 52/11359 1.98 (0.98, 4.03) 0.11
 No 33/3533 ref 9/3341 ref
Residential proximity to oil spillc
 Direct/indirect 97/10377 0.99 (0.67, 1.48) 45/8114 1.52 (0.84, 2.76) 0.26
 Away from the spill 36/5199 ref 16/6586 ref
  Among clean-up workers and responders without prevalent MI (n = 24,009)  
Ever smoker (n = 12,510) Never smoker (n = 11,701)
Maximum exposure jobd
 Response Work 14/2338 0.66 (0.30, 1.45) 7/1974 0.80 (0.28, 2.25) < 0.01
 Operations Work 30/2471 1.21 (0.60, 2.44) 10/1744 1.11 (0.42, 2.93)
 Clean-up on Water 11./1955 0.53 (0.23, 1.22) 9/1651 1.02 (0.38, 2.75)
 Decontamination 26/1856 1.74 (0.86, 3.51) 7/1587 1.20 (0.43, 3.39)
 Clean-up on Land 7/1764 0.47 (0.18, 1.20) 11/1724 1.89 (0.75, 4.72)
 Administrative Support 12/1659 ref 8/2679 ref
Work duration
  > 180 days 24/2699 1.53 (0.71, 3.30) 14/2463 2.90 (0.83, 10.09) 0.21
 91–180 days 37/4306 1.37 (0.66, 2.83) 20/3751 2.54 (0.76, 8.55)
 31–90 days 30/3647 1.34 (0.64, 2.80) 15/3681 2.16 (0.63, 7.43)
 1–30 days 9/1391 ref 3/1464 ref
Ever had to stop work due to heatd
 Yes 53/4125 2.39 (1.58, 3.60) 18/3096 1.23 (0.68, 2.24) 0.07
 No 42/7048 ref 30/6796 ref
Worked near burning oild
 Yes 10/1104 1.11 (0.57, 2.14) 4/969 0.98 (0.35, 2.74) 0.31
 No 90/10939 ref 48/10390 ref
Maximum overall THC exposure
  ≥ 3.00 ppm 19/1822 1.67 (0.79, 3.55) 6/1502 1.43 (0.47, 4.34) 0.05
 1.00–2.99 ppm 34/4073 1.13 (0.56, 2.26) 16/3111 1.32 (0.53, 3.32)
 0.30–0.99 ppm 36/4061 1.43 (0.73, 2.83) 23/3614 2.29 (0.97, 5.39)
  < 0.30 ppm 11/2071 ref 7/3122 ref
  1. aNumber of observations included in the fully adjusted model, by exposure status
  2. bRisk ratios (RR) adjusting for age, gender, BMI, education, and residential proximity to the oil spill
  3. cModels adjust for duration of clean-up work in addition to the confounders age, gender, BMI, and education
  4. dModels adjust for duration of clean-up work in addition to the confounders age, gender, BMI, education, and residential proximity to the oil spill
  5. 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
  6. *Alpha = 0.05