Effect of Long Working Hours on Self-reported Hypertension among Middle-aged and Older Wage Workers

Table 3 Number of working hours per week and the risk of self-reported hypertension in 1079 normotensive workers

	Number of working hours per week
	≤40	41–50	51–60	≥61	p for trend
	(n = 421)	(n = 337)	(n = 178)	(n = 143)
No. of onsets	24	31	14	16
Follow-up periods (person-months)	1569.12	1230.38	646.68	528.03
Rate per 1000 person-months	15.30	25.20	21.65	30.30
Model 1 (95% CI)	1.00 (reference)	1.64 (0.97–2.75)	1.50 (0.79–2.84)	1.99 (1.06–3.73)	0.036
Model 2 (95% CI)	1.00 (reference)	1.63 (0.97–2.74)	1.46 (0.77–2.78)	1.81 (0.95–3.44)	0.074
Model 3 (95% CI)	1.00 (reference)	1.79 (1.06–3.03)	1.72 (0.89–3.30)	1.95 (1.02–3.73)	0.033
Model 4 (95% CI)	1.00 (reference)	2.20 (1.19–4.06)	2.40 (1.07–5.39)	2.87 (1.33–6.20)	0.013

Model 1 was not adjusted.
Model 2 was adjusted for age and sex.
Model 3 was adjusted for age, sex and health-related factors including smoking habit, alcohol habit, regular exercise, and body mass index (BMI).
Model 4 was adjusted for age, sex, health-related factors, education and occupational factors including income, occupation, form of emplyment, and working days per week.
All hazard ratios were calculated using a Cox proportional hazards model with weighted cases.
CI = Confidence interval.

ISSN: 2052-4374