Table 3.
Variables | Nationala | Eastern Chinab | Central Chinab | Western Chinab | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
OR | 95% CI | P value | OR | 95% CI | P value | OR | 95% CI | P value | OR | 95% CI | P value | |
Region (ref: eastern China) | ||||||||||||
Central China | 0.81 | 0.67–0.98 | 0.028 | |||||||||
Western China | 0.90 | 0.75–1.09 | 0.296 | |||||||||
Age (ref: 21-) | ||||||||||||
30- | 1.11 | 0.87–1.41 | 0.393 | 1.40 | 0.90–2.17 | 0.132 | 1.03 | 0.67–1.59 | 0.885 | 1.10 | 0.74–1.63 | 0.649 |
40- | 1.07 | 0.80–1.42 | 0.670 | 1.48 | 0.88–2.50 | 0.144 | 1.03 | 0.61–1.73 | 0.918 | 0.96 | 0.59–1.57 | 0.879 |
50- | 0.75 | 0.50–1.13 | 0.171 | 1.21 | 0.59–2.49 | 0.608 | 0.80 | 0.39–1.65 | 0.551 | 0.43 | 0.20–0.89 | 0.023 |
Gender (ref: male) | ||||||||||||
Female | 0.94 | 0.80–1.10 | 0.431 | 0.97 | 0.75–1.26 | 0.821 | 0.75 | 0.57–0.99 | 0.045 | 1.19 | 0.88–1.61 | 0.267 |
Marital status (ref: unmarried/widowed/divorced) | ||||||||||||
Married | 1.11 | 0.89–1.39 | 0.350 | 1.29 | 0.87–1.90 | 0.200 | 0.82 | 0.54–1.22 | 0.322 | 1.28 | 0.87–1.86 | 0.206 |
Education level (ref: associate’s degree or vocational diploma) | ||||||||||||
Bachelor degree | 1.06 | 0.88–1.27 | 0.557 | 1.12 | 0.76–1.66 | 0.565 | 1.15 | 0.83–1.58 | 0.402 | 0.98 | 0.74–1.31 | 0.894 |
Master degree or higher | 0.82 | 0.58–1.17 | 0.277 | 0.91 | 0.51–1.61 | 0.739 | 0.86 | 0.45–1.67 | 0.663 | 0.71 | 0.32–1.58 | 0.397 |
Work tenure (years, ref: 1-) | ||||||||||||
10- | 1.14 | 0.94–1.37 | 0.192 | 1.05 | 0.78–1.42 | 0.734 | 1.18 | 0.83–1.67 | 0.364 | 1.18 | 0.81–1.72 | 0.389 |
20- | 0.90 | 0.63–1.28 | 0.556 | 0.77 | 0.43–1.37 | 0.378 | 0.99 | 0.53–1.83 | 0.969 | 0.85 | 0.43–1.68 | 0.647 |
Contract status (ref: permanent) | ||||||||||||
Temporary | 0.84 | 0.71–1.00 | 0.047 | 0.99 | 0.69–1.41 | 0.950 | 0.90 | 0.67–1.21 | 0.502 | 0.71 | 0.54–0.94 | 0.017 |
Professional title (ref: elementary or below) | ||||||||||||
Intermediate | 1.16 | 0.96–1.39 | 0.121 | 0.97 | 0.70–1.34 | 0.852 | 1.31 | 0.94–1.82 | 0.108 | 1.11 | 0.80–1.54 | 0.545 |
Senior | 0.89 | 0.65–1.20 | 0.443 | 0.54 | 0.33–0.91 | 0.020 | 0.90 | 0.52–1.57 | 0.711 | 1.45 | 0.81–2.57 | 0.209 |
Management responsibility (ref: yes) | ||||||||||||
No | 0.44 | 0.35–0.54 | < 0.001 | 0.34 | 0.23–0.48 | < 0.001 | 0.48 | 0.33–0.69 | < 0.001 | 0.50 | 0.34–0.72 | < 0.001 |
Income level (ref: low) | ||||||||||||
Moderate | 0.77 | 0.65–0.92 | 0.003 | 0.91 | 0.68–1.22 | 0.530 | 0.68 | 0.50–0.93 | 0.015 | 0.76 | 0.56–1.03 | 0.078 |
High | 1.08 | 0.67–1.72 | 0.761 | 1.12 | 0.45–2.79 | 0.809 | 1.05 | 0.50–2.19 | 0.907 | 1.10 | 0.46–2.61 | 0.836 |
Working hours per week (ref: ≤ 40) | ||||||||||||
> 40 | 1.89 | 1.61–2.23 | < 0.001 | 2.08 | 1.56–2.78 | < 0.001 | 1.61 | 1.21–2.14 | 0.001 | 2.00 | 1.51–2.66 | < 0.001 |
Working overtime (ref: never) | ||||||||||||
Occasion | 2.50 | 1.86–3.35 | < 0.001 | 1.98 | 1.24–3.19 | 0.005 | 2.76 | 1.66–4.61 | < 0.001 | 2.91 | 1.63–5.18 | < 0.001 |
Frequent | 6.52 | 4.76–8.93 | < 0.001 | 4.25 | 2.57–7.03 | < 0.001 | 7.90 | 4.55–13.73 | < 0.001 | 8.89 | 4.80–16.47 | < 0.001 |
Occupational development opportunities (ref: low) | ||||||||||||
Moderate | 0.79 | 0.67–0.92 | 0.002 | 0.91 | 0.71–1.18 | 0.491 | 0.81 | 0.61–1.07 | 0.131 | 0.68 | 0.52–0.89 | 0.005 |
High | 0.94 | 0.70–1.26 | 0.680 | 1.31 | 0.82–2.09 | 0.261 | 0.53 | 0.31–0.91 | 0.022 | 1.22 | 0.68–2.19 | 0.505 |
Abbreviations:CI confidence interval, GPs general practitioners, OR odds ratio, ref reference
aAdjustment for region (eastern China, central China, western China), age (21–, 30–, 40–, 50–), gender (male, female), marital status (unmarried/widowed/divorced, married), education level (associate’s degree or vocational diploma, bachelor degree, master degree or higher), work tenure (1–, 10–, 20–), contract status (permanent, temporary), professional title (elementary or below, intermediate, senior), management responsibility (yes, no), income level (low, moderate, high), working hours per week (≤ 40, > 40), working overtime (never, occasion, frequent), and occupational development opportunities (low, moderate, high)
bAdjustment for age (21–, 30–, 40–, 50–), gender (male, female), marital status (unmarried/widowed/divorced, married), education level (associate’s degree or vocational diploma, bachelor degree, master degree or higher), work tenure (1–, 10–, 20–), contract status (permanent, temporary), professional title (elementary or below, intermediate, senior), management responsibility (yes, no), income level (low, moderate, high), working hours per week (≤ 40, > 40), working overtime (never, occasion, frequent), and occupational development opportunities (low, moderate, high)