Table 3 Odds ratios of variables associated with sleep disturbance

Gender (reference [ref]: female)

0.85

0.61 - 1.17

0.77

0.54 - 1.09

Age

1.01

0.99 - 1.02

1.01

0.99 - 1.02

Educational status(ref: Middle school or below)

 High school

0.73

0.46 - 1.16

0.69

0.42 - 1.12

 College or above

1.17

0.71 - 1.92

0.93

0.51 - 1.69

Drinking frequency (ref: none)

 ≤1 per week

1.32

0.90 - 1.95

1.26

0.85 - 1.88

 ≥2 per week

1.72

1.14 - 2.61

1.78

1.17 - 2.72

Hypertension (ref: no)

1.28

0.78 - 2.11

1.10

0.65 - 1.85

Obesity (ref: no)

1.60

0.89 - 2.89

1.73

0.93 - 3.21

Depressive symptoms (ref: no)

17.36

11.12 - 27.09

15.16

9.49 - 24.23

Job type (ref: white collar)

 Service

0.45

0.26 - 0.76

 Blue collar

0.53

0.33 - 0.84

Working time/wk (ref: 40–48 hr)

 <40

1.21

0.72 - 2.02

 49-60

1.31

0.91 - 1.88

 ≥61

2.32

1.51 - 3.57

Shift work (ref: no)

2.49

1.68 - 3.70

Number of employees (ref: <5)

 5-49

0.62

0.42 - 0.91

 50-299

1.17

0.76 - 1.81

 ≥300

0.59

0.33 - 1.05

Physical risk exposure (ref: unexposed)

1.70

1.31 - 2.21

1.31

0.94 - 1.83

1.47

1.05 - 2.07

Chemical risk exposure (ref: unexposed)

1.57

1.18 - 2.07

1.00

0.69 - 1.45

1.13

0.77 - 1.64

Biological risk exposure (ref: unexposed)

2.48

1.59 - 3.88

1.67

0.99 - 2.80

1.26

0.72 - 2.21

High job demand (high/low)

3.74

2.88 - 4.86

3.12

2.34 - 4.17

2.93

2.16 - 3.98

Insufficient job control (high/low)

0.84

0.64 - 1.10

0.76

0.57 - 1.02

0.78

0.57 - 1.05

Inadequate social support (high/low)

1.50

1.15 - 1.95

1.52

1.13 - 2.05

1.57

1.14 - 2.15

Job insecurity (high/low)

1.11

0.85 - 1.45

1.04

0.78 - 1.39

1.08

0.80 - 1.46

Lack of reward (high/low)

1.86

1.43 - 2.41

1.46

1.09 - 1.95

1.45

1.08 - 1.96