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Table 4 Simple and multiple logistic regression analysis of factors affecting sleep quality

From: The relationship between serum vitamin D levels and sleep quality in fixed day indoor field workers in the electronics manufacturing industry in Korea

Variables

 

Unadjusted

Adjusteda

ORb

95% CIc

ORb

95% CIc

Vitamin D,

≥10

1.00

 

1.00

 

ng/mL

<10

1.43

1.10–1.87

1.36

1.01–1.82

Age, years

≥30

1.00

 

1.00

 

<30

1.63

1.27–2.09

1.26

0.87–1.83

Sex

Male

1.00

 

1.00

 

Female

1.50

1.12–2.01

1.49

0.99–2.09

Regular exercise,

≥3

1.00

 

1.00

 

times per week

<3

1.05

0.81–1.36

1.04

0.80–1.37

Smoking

Never/former

1.00

 

1.00

 

Curren

1.13

0.86–1.48

1.21

0.90–1.64

Risky drinkingd

No

1.00

 

1.00

 

Yes

1.34

0.95–1.76

1.40

0.97–1.87

Body mass index,

<25

1.00

 

1.00

 

kg/m2

≥25

0.91

0.70–1.18

1.01

0.76–1.33

Marital status

Married

1.00

 

1.00

 

Unmarried

1.67

1.30–2.14

1.47

1.04–2.08

Education level

≥College

1.00

 

1.00

 

≤High school

1.59

1.23–2.06

1.32

1.03–1.77

Job tenure, years

<5

1.00

 

1.00

 

5–9

1.06

0.77–1.45

1.23

0.85–1.77

≥10

0.74

0.55–0.99

1.04

0.69–1.56

Job stress

Low

1.00

 

1.00

 

High

1.55

1.15–2.09

1.85

1.38–2.47

Test seasone

Spring

1.00

 

1.00

 

Summer

1.21

0.84–1.74

1.14

0.76–1.70

Autumn

1.11

0.68–1.81

1.14

0.69–1.90

Winter

1.27

0.90–1.80

1.21

0.84–1.74

  1. aAdjusted for vitamin D serum concentration, age, sex, regular exercise, smoking, risky drinking, body mass index, marital status, education level, job tenure, and job stress, test season
  2. bOdds ratio
  3. cConfidence interval
  4. dRisky drinking: 2 or more times per week and 7 (females: 5) or more drinks per drinking session
  5. eSpring, March–May; summer, June–August; autumn, September–November; winter, December–February
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Annals of Occupational and Environmental Medicine

ISSN: 2052-4374

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