Table 3.

Hazard ratio (HR) and 95% confidence interval (CI) for psychiatric disorder by job stress in bus drivers.

Independent variable a	Model 1 a		Model 2 b		Model 3 c
	HR	95% CI	HR	95% CI	HR	95% CI
Demand-Control-Support Model
Psychological demands >30 (reference≤30)	1.06	0.68–1.65	1.07	0.69–1.67	1.15	0.73–1.81
Decision latitude >60 (reference ≤60)	1.34	0.87–2.06	1.29	0.83–2.01	1.31	0.83–2.06
High job strain (reference = low strain)	1.01	0.61–1.66	1.03	0.62–1.69	1.12	0.64–1.70
Job Fatigue Model
SOFI (reference <3)
3–4.9	0.83	0.44–1.58	0.84	0.44–1.60	0.98	0.51–1.90
≥5	1.38	0.85–2.21	1.40	0.86–2.26	1.52	0.93–2.49

^aEach independent variable (1–4) was solely included in the models.

^bAdjusted for age, body mass index, marital status, and education.

^cModel 1 and additionally adjusted for drinking, smoking, and exercise.

^d Model 2 and additionally adjusted for bus driving experience, shift work and history of chronic diseases.