Table 2. Unadjusted and adjusted hazard ratios of work patterns and psychosocial hazards on CVD in bus drivers (n = 707).

		Univariate Analysis				Multivariate Analysis a.
	Independent variables b	HR	95% CI		p-value	HR	95% CI		p-value
1	Metabolic syndrome (Ref.< No)
	Yes	1.77	1.12	2.79	0.014	1.38	0.80	2.36	0.247
2	Long working hours (Ref. Working hour ≤12 hour/ day)
	Working hour >12 hour/ day	1.93	1.23	3.02	0.004	1.76	1.11	2.79	0.016
3	Shift work (Ref. No shift work)
	Shift work	0.74	0.43	1.28	0.281	0.68	0.39	1.18	0.172
4	Job Content Questionnaire (Ref. Low strain)
	High strain	1.17	0.71	1.94	0.538	1.08	0.65	1.80	0.772
5	Stress Satisfaction Offset Score (Ref. = +2~+1)
	-2 ~ 0	1.38	0.78	2.42	0.270	1.20	0.67	2.14	0.539
6	Swedish Occupational Fatigue Inventory (Ref. <3)
	> = 3	1.51	0.95	2.39	0.080	1.58	0.98	2.55	0.060

CVD, cardiovascular and cerebrovascular diseases; HR, hazard ratios; CI, confidence interval; BMI, body mass index.

^a. Adjusted for age, BMI, education, drinking, smoking, and exercise.

^b. Each independent variable (1–6) was solely included in the models