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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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BMC Public Health

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