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Table 1 General characteristics of the subjects

From: Occupational Factors Associated with Changes in the Body Mass Index of Korean Male Manual Workers

Variables 5 years or less* More than 5 years*
  Mean ± SD (kg/m 2) No(%) BMI change (Mean ± SD, kg/m 2) Mean ± SD (kg/m 2) No(%) BMI change (Mean ± SD, kg/m 2)
Age (years) 32.60 ± 6.52    38.31 ± 7.23   
Education       
   High school or lower   55(36.4) 0.43 ± 1.30   92(62.2) 0.40 ± 1.06
   College or higher   96(63.6) 0.38 ± 0.90   56(37.8) 0.06 ± 0.93
Marital status       
   Single or divorced   70(46.4) 0.41 ± 1.09   35(23.6) 0.08 ± 1.05
   Married   81(53.6) 0.39 ± 1.04   113(76.4) 0.33 ± 1.01
Smoking       
   Never or formerly smoked   64(42.4) 0.31 ± 1.00   61(41.2) 0.28 ± 1.00
   Started or resumed smoking   8( 5.3) 0.57 ± 1.58   2( 1.4) −0.39 ± 0.49
   Quit smoking   7( 4.6) 0.43 ± 1.15   7( 4.7) 1.12 ± 1.01
   Continued smoking   66(43.7) 0.52 ± 1.07   69(46.6) 0.20 ± 1.06
Alcohol drinking       
   Non-drinking   17(11.3) 0.13 ± 0.82   20(13.5) 0.42 ± 1.17
   No change   22(14.6) 0.50 ± 0.80   21(14.2) 0.39 ± 0.70
   Decrease in drinking   60(39.7) 0.45 ± 1.05   57(38.5) 0.30 ± 1.16
   Increase in drinking   46(30.5) 0.46 ± 1.27   41(27.7) 0.11 ± 0.96
Regular exercise§       
   Not performed   116(76.8) 0.39 ± 0.98   103(69.6) 0.18 ± 0.94
   Stopped performing   12( 7.9) 0.48 ± 1.31   15(10.1) 0.55 ± 0.88
   Began performing   17(11.3) 0.56 ± 1.39   23(15.5) 0.56 ± 1.42
   Continued performing   6( 4.0) 0.11 ± 1.17   7( 4.7) −0.02 ± 0.71
Coffee drinking (cups/day) 2.41 ± 1.54    2.74 ± 1.69   
Amount of sleep       
   < 7 hours   80(53.0) 0.42 ± 1.03   79(53.4) 0.24 ± 0.94
   ≥ 7 hours   71(47.0) 0.38 ± 1.09   69(46.6) 0.31 ± 1.11
  1. * Length of experience working at the present post.
  2. † The change in smoking status between 2012 and 2013.
  3. ‡ The change in the weekly amount of alcohol drinking between 2012 and 2013.
  4. § The change in regular exercise performance between 2012 and 2013. Those performing high- or moderate-intensity exercise were regarded as getting regular exercise.