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Table 3 Follow up in hearing level (dB) at the average of 2, 3 and 4 kHz across the four years of the study period

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

   2006 2007 2008 2009
Left ear Firefighter 15.93 ± 12.51 17.08 ± 13.43 16.95 ± 13.79 16.46 ± 14.09
  Factory worker 32.84 ± 14.41 33.21 ± 15.06 31.56 ± 15.98 33.60 ± 17.00
Right ear Firefighter 15.10 ± 12.72 15.84 ± 13.25 15.95 ± 13.74 15.59 ± 14.15
  Factory worker 29.96 ± 13.48 29.73 ± 14.06 28.40 ± 13.66 30.16 ± 14.46
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