Table 2.

Rate ratio for mortality among employees in Denmark 2000–2014 (primary analyses)

Population	Night-time work	Persons	Person years	Cases	Rate ratio	95% CI
All workersa	Yes	20,077	159,584	464	1.07	0.97–1.19
	No	139,856	1,078,417	2910	1.00	–
Male workersb	Yes	13,304	105,692	366	1.07	0.95–1.20
	No	72,708	557,249	1972	1.00	–
Female workersb	Yes	6773	53,892	98	1.10	0.89–1.35
	No	67,148	521,168	938	1.00	–
Workers with higher socio economic statusc	Yes	6118	45,071	107	1.13	0.92–1.39
	No	41,182	289,793	659	1.00	–
Workers with middle socio economic statusc	Yes	1599	13,099	45	1.55	1.14–2.11
	No	28,048	223,810	468	1.00	–
Workers with lower socio economic statusc	Yes	9600	80,388	253	1.00	0.88–1.15
	No	56,226	457,749	1473	1.00	–
Workers with unknown socio economic statusc	Yes	2760	21,025	59	1.03	0.78–1.37
	No	14,400	107,064	310	1.00	–

CI confidence interval

^aThe analysis was adjusted for calendar time, time passed since start of follow-up, age, weekly working hours, sex and socio-economic status

^bThe analysis was adjusted for calendar time, time passed since start of follow-up, age, weekly working hours, and socio-economic status

^cThe analysis was adjusted for calendar time, time passed since start of follow-up, age, weekly working, and sex