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Table 1 Demographic and behavioral characteristics of study subjects from the annual routine health exam and study questionnaire

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

   Firefighters Farm Machinery Factory Workers P-Values
Total (N)   371 81 --
Noise level (dBA) Mean Range 76-79* 82.45 --
   68-115* 67-98  
Age at study initiation (2006) Mean (S.D.) 39.46 (6.89) 44.98 (6.08) < 0.0001
Alcohol (%)   222 50 < 0.0001
   no   40.2 38.3  
   yes   59.8 61.7  
Smoking (%)   66 34 < 0.0001
   no   82.2 58  
   yes   17.8 42  
Work period in months (2006) Mean (SD) 134.01 (90.34) 256.20 (72.74) < 0.0001
Duration of current employment 0-10 years 172 (46.36%) 3 (3.7%) --
  11-20 years 155 (41.78%) 35 (43.2%)  
  > 20 years 44 (11.86%) 43 (53.1%)  
Shift length   9 or 15 8 or 10 --
  1. * Historically reported values in Korea. See discussion for fuller description