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Table 4 Follow up of hearing level (dB) at the average of 2, 3 and 4 kHz across the four study periods stratified by work duration in years

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

Years at job   2006 2007 2008 2009 P-value
≤ 10       0.257
   Firefighter 13.11 ± 10.69 13.74 ± 11.10 13.53 ± 11.57 12.75 ± 11.92  
   Factory worker 24.72 ± 13.47 22.50 ± 15.07 20.83 ± 15.21 23.33 ± 15.43  
10 - ≤ 20       < 0.0001
   Firefighter 16.56 ± 11.67 17.31 ± 12.44 17.57 ± 13.01 17.28 ± 13.06  
   Factory worker 29.07 ± 13.44 28.10 ± 12.93 26.76 ± 13.72 28.57 ± 14.80  
> 20       0.001
   Firefighter 21.80 ± 13.22 24.72 ± 13.61 24.85 ± 13.44 25.27 ± 13.52  
   Factory worker 33.76 ± 12.06 34.85 ± 12.97 33.24 ± 12.76 35.17 ± 13.50  
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