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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