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Table 1 General characteristics of the selected population

From: Effect of Long Working Hours on Self-reported Hypertension among Middle-aged and Older Wage Workers

Characteristics n (%) Number of working hours per week Overtime workers n (%)
Sex    
  Male 703(65.2) 47.37 ± 13.53 417(59.3)
  Female 376(34.8) 48.26 ± 15.41 241(64.1)
Age (years)    
  45–49 441(40.9) 47.23 ± 12.71 271(61.5)
  50–54 311(28.8) 47.15 ± 13.46 176(56.6)
  55–59 174(16.1) 47.76 ± 14.07 109(62.6)
  60–64 93(8.6) 48.94 ± 18.68 61(65.6)
  ≥65 60(5.6) 51.53 ± 19.73 41(68.3)
Education    
  Elementary school graduation or less 218(20.2) 48.05 ± 17.40 135(61.9)
  Middle school graduation 217(20.1) 50.41 ± 15.96 165(70.0)
  High school graduation 431(39.9) 48.01 ± 12.82 275(63.8)
  College graduation or beyond 213(19.7) 43.86 ± 10.08 96(45.1)
Income (won)    
  ≤990,000 312(28.9) 45.67 ± 17.65 178(57.1)
  1,000,000–1,990,000 362(33.5) 50.73 ± 14.35 264(72.9)
  2,000,000–2,990,000 178(16.5) 48.11 ± 11.25 119(66.9)
  ≥3,000,000 198(18.4) 43.26 ± 8.15 81(40.9)
  Neglect to answer 29(2.7) 47.97 ± 11.13 16(55.2)
Occupation    
  Managers, professionals and experts 174(16.1) 43.17 ± 9.27 108(45.6)
  Engineers, semi-experts 63(5.8) 41.11 ± 10.86 27(42.9)
  Office workers 100(9.3) 45.67 ± 11.16 52(52.0)
  Service and sales workers 157(14.6) 53.36 ± 17.26 111(70.7)
  Skilled agricultural, forestry and fishery workers 18(1.7) 45.39 ± 16.15 194(69.0)
  Craft and related trades workers 131(12.1) 47.43 ± 11.94 92(70.2)
  Machine operator, assembly workers 132(12.2) 49.80 ± 13.93 91(63.5)
  Elementary workers 304(28.2) 48.68 ± 15.80 193(63.5)
Form of employment    
  Regular 772(71.5) 48.56 ± 12.78 491(63.6)
  Temporary or part-time 307(28.5) 45.46 ± 17.13 167(54.4)
BMI (kg/m 2 )    
  <25 870(80.6) 47.63 ± 13.76 538(61.8)
  ≥25 209(19.4) 47.89 ± 15.99 120(57.4)
Alcohol habit    
  No 453(42.0) 48.35 ± 14.61 293(64.7)
  Yes 687(57.2) 47.20 ± 13.91 365(58.3)
Smoking habit    
  Past or nonsmoker 735(68.1) 47.67 ± 14.73 455(61.9)
  Current smoker 344(31.9) 47.69 ± 15.20 203(59.0)
Regular Exercise    
  Once a week or more 433(40.1) 45.14 ± 13.34 224(51.7)
  Less than once a week 646(59.9) 49.38 ± 14.53 434(67.2)
Working days per week    
  ≤5 days 539(50.0) 40.92 ± 13.15 158(29.3)
  ≥6 days 540(50.0) 54.43 ± 11.84 500(92.6)
Self-reported hypertension during follow-up    
  None 994(92.1) 47.45 ± 14.00 597(60.1)
  Hypertension 85(7.9) 50.38 ± 16.30 61(71.8)
Total 1079(100.0) 47.68 ± 14.21 658(61.0)