Table 4 Bivariate logistic regression for the association between demographic, occupational factors and five types of WPV

Male

1.73(1.60–1.87)

0.81(0.76–0.86)

1.15(1.07–1.24)

NA

NA

Shift work

1.56(1.46–1.67)

1.31(1.27–1.36)

1.32(1.25–1.38)

1.33(1.19–1.48)

1.36(1.17–1.60)

Age group(yr)

 < 30

1.26(1.13–1.40)

1.05(0.99–1.11)

0.86(0.79–0.93)

1.85(1.54–2.23)

2.07(1.60–2.68)

 30–39

1.22(1.12–1.32)

1.07(1.03–1.12)

0.99(0.94–1.05)

1.34(1.15–1.55)

1.39(1.13–1.72)

 ≥ 40

Ref

Ref

Ref

Ref

Ref

Marital status

 Married or cohabitang

Ref

Ref

Ref

Ref

Ref

 Separated, widowed, or divorced

1.42(1.23–1.64)

1.27(1.17–1.38)

1.30(1.17–1.45)

2.09(1.68–2.61)

2.04(1.50–2.77)

 Never married

1.39(1.30–1.48)

1.20(1.15–1.24)

1.16(1.09–1.22)

1.71(1.54–1.90)

1.54(1.33–1.78)

Education level

 Master degree and above

1.45(1.27–1.66)

1.27(1.17–1.38)

1.32(1.18–1.47)

NA

NA

 Bachelor’s degree

1.11(1.01–1.21)

1.19(1.13–1.25)

1.11(1.04–1.20)

NA

NA

 Associate degree and below

Ref

Ref

Ref

NA

NA

Professional title

 Senior

1.24(1.08–1.42)

1.16(1.07–1.25)

1.50(1.36–1.66)

1.12(0.86–1.45)

0.93(0.63–1.36)

 Intermediate

1.08(1.01–1.15)

1.17(1.13–1.21)

1.22(1.16–1.28)

1.06(0.95–1.19)

1.06(0.91–1.24)

 Primary

Ref

Ref

Ref

Ref

Ref

Working hours / week

 ≥ 50 h

1.23(1.14–1.33)

1.17(1.12–1.22)

1.17(1.10–1.24)

1.37(1.21–1.55)

1.39(1.18–1.64)

 40–50 h

1.03(0.97–1.09)

1.17(1.14–1.21)

1.06(1.01–1.10)

1.11(1.01–1.23)

1.03(0.90–1.17)

 ≤ 39 h

Ref

Ref

Ref

Ref

Ref