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Table 3 Results of univariate logistic regression analysis for long overtime work hours and excessive overtime work

From: Effects of personality on overtime work: a cross-sectional pilot study among Japanese white-collar workers

Factor Classification Long overtime work hours Excessive overtime work
   OR 95% CI P OR 95% CI P
Socio-demographic factors          
   Sex Male 1.00     1.00    
  Female 0.18 0.10 0.30 <0.01 0.26 0.14 0.47 <0.01
   Age 20-29 1.00     1.00    
  30-39 0.67 0.31 1.45 0.31 0.69 0.31 1.52 0.35
  40-49 0.57 0.25 1.28 0.17 0.31 0.13 0.76 0.01
  50- 0.69 0.29 1.64 0.40 0.58 0.23 1.42 0.23
   BMI 18.5-25 1.00     1.00    
  <18.5 0.65 0.30 1.40 0.27 0.66 0.26 1.71 0.40
  ≥25 2.22 1.15 4.32 0.02 1.98 1.03 3.83 0.04
   Sleep ≥6 hours 1.00     1.00    
  <6 hours 0.92 0.46 1.85 0.82 1.72 0.83 3.57 0.14
   Drinking Never or occasionally 1.00     1.00    
  Sometimes or more often 0.95 0.57 1.56 0.83 0.86 0.49 1.51 0.59
   Smoking Never or ex-smoker 1.00     1.00    
  Current smoker 1.48 0.75 2.90 0.26 1.09 0.53 2.28 0.81
   Physical exercise Sometimes or more often 1.00     1.00    
  Never or occasionally 0.84 0.52 1.36 0.47 1.12 0.65 1.91 0.69
   Hobbies Yes 1.00     1.00    
  No 1.01 0.60 1.70 0.96 0.92 0.51 1.64 0.77
   Meal times Regular 1.00     1.00    
  Irregular 3.91 1.71 8.97 <0.01 3.82 1.84 7.94 <0.01
   Current illness No 1.00     1.00    
  Yes 0.68 0.39 1.19 0.18 0.55 0.28 1.08 0.08
   Marital status Married 1.00     1.00    
  Unmarried 1.32 0.79 2.18 0.29 1.78 1.03 3.09 0.04
   Educational level Graduate or higher 1.00     1.00    
  Undergraduate 0.74 0.46 1.20 0.22 0.66 0.38 1.14 0.14
   Stress at home No 1.00     1.00    
  Yes 0.65 0.39 1.06 0.08 0.88 0.51 1.54 0.66
   Human relations at home Good 1.00     1.00    
  Poor 0.90 0.39 2.05 0.80 1.25 0.52 3.05 0.62
Workplace-related factors          
   Position Clerk 1.00     1.00    
  Chief 0.92 0.35 2.41 0.87 0.83 0.33 2.11 0.70
  Assistant manager or higher 1.12 0.58 2.20 0.73 0.61 0.32 1.16 0.13
  Part-time worker 0.05 0.02 0.13 <0.01 0.03 0.01 0.14 <0.01
   Commuting time <30 minutes 1.00     1.00    
  ≥30 minutes 0.80 0.48 1.33 0.39 0.80 0.45 1.42 0.44
   Job demand Low 1.00     1.00    
  High 3.15 1.84 5.41 <0.01 2.67 1.39 5.11 <0.01
   Decision latitude High 1.00     1.00    
  Low 1.90 0.92 3.93 0.08 2.08 1.01 4.30 0.048
   Social support High 1.00     1.00    
  Low 1.28 0.74 2.21 0.37 1.63 0.91 2.93 0.10
   Taking paid holiday Yes 1.00     1.00    
  No 5.01 2.38 10.55 <0.01 4.47 2.33 8.54 <0.01
   Stopping work No 1.00     1.00    
  Yes 2.42 1.45 4.02 <0.01 1.97 1.14 3.40 0.01
   Difficulty going home No 1.00     1.00    
  Yes 3.32 1.73 6.37 <0.01 1.85 0.99 3.47 0.05
   Fear of the boss No 1.00     1.00    
  Yes 2.09 1.15 3.81 0.02 2.63 1.43 4.82 <0.01
   Work motivation Yes 1.00     1.00    
  No 1.31 0.67 2.56 0.43 1.26 0.61 2.58 0.54
   Work purpose Yes 1.00     1.00    
  No 0.98 0.54 1.78 0.95 1.40 0.74 2.67 0.30
   Success motivation Yes 1.00     1.00    
  No 0.58 0.31 1.07 0.08 0.89 0.46 1.72 0.73
   Gratitude for employment Yes 1.00     1.00    
  No 0.93 0.48 1.80 0.82 0.59 0.26 1.34 0.21
Big Five personality factors          
   Extraversion High 1.00     1.00    
  Low 1.57 0.97 2.55 0.07 3.07 1.73 5.45 <0.01
   Agreeableness High 1.00     1.00    
  Low 1.35 0.83 2.19 0.22 2.06 1.18 3.61 0.01
   Conscientiousness High 1.00     1.00    
  Low 1.27 0.78 2.06 0.33 1.75 1.01 3.05 0.047
   Emotional stability High 1.00     1.00    
  Low 1.48 0.91 2.40 0.11 2.49 1.42 4.37 <0.01
   Openness High 1.00     1.00    
  Low 1.23 0.76 2.00 0.39 1.36 0.79 2.35 0.26