Table 1

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

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

--


* Historically reported values in Korea. See discussion for fuller description

Chung et al. BMC Public Health 2012 12:87   doi:10.1186/1471-2458-12-87

Open Data