Variable

OB (n = 96)

non-OB (n = 239)

p-value

mean

SD

mean

SD

Stressa

Workload

1.95

0.69

1.89

0.67

p = 0.48

Mental workload

1.88

0.7

1.77

0.61

p = 0.29

Job control

2.51

0.65

2.59

0.59

p = 0.63

Problem in personal relationship

1.62

0.54

1.62

0.56

p = 0.96

Support from colleagues

2.53

0.62

2.7

0.56

p = 0.04

Reward from work

2.42

0.66

2.62

0.62

p = 0.03

Lifestyle

The amount of drinking for 1 week (g)

180.4

149.7

194.2

171.8

p = 0.74

1-day average smoking number

9.6

12.7

10.1

12.3

p = 0.71

Overtime for the previous month (h)

10.8

14.6

14.1

17.1

p = 0.04

1-day average sleeping hours (h)

6.9

0.8

7.1

0.9

p = 0.03