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Table 6 Coefficients and confidence intervals for all covariates using multiple regression for the first year of observations (2006).

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

  β Confidence Interval
Age 0.458 0.15-0.767
Work duration 0.004 -0.02-0.028
Smoking status (no/yes)* 0.983 -1.695-3.661
Group (Firefighter/Factory worker)** 12.544 9.196-15.892
  1. Age and group (firefighter or farm machinery factory worker) remained significant in the final model