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Table 5 Coefficients and confidence intervals for all covariates shown by year using simple regression.

From: Hearing effects from intermittent and continuous noise exposure in a study of Korean factory workers and firefighters

  2006 2007 2008 2009
  β CI β CI β CI β CI
Age 0.703 0.514-0.865 0.782 0.616-0.947 0.777 0.609-0.945 0.863 0.688-1.038
Work duration 0.055 0.043-0.066 0.059 0.047-0.071 0.058 0.046-0.070 0.065 0.053-0.077
Smoking status(no/yes)* 2.694 -0.293-5.68 1.493 -1.603-4.589 2.053 -1.071-5.178 1.445 -1.843-4.733
Group
(Firefighter/Factory worker)**
15.887 13.028-18.747 15.012 11.992-18.032 13.528 10.407-16.649 15.858 12.644-19.073
  1. Age, duration and group (firefighter or farm machinery factory worker) were all statistically significant
  2. * Reference group is "No."
  3. ** Reference group is firefighters
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