Quantification of the healthy worker effect: a nationwide cohort study among electricians in Denmark

BMC Public Health

Table 4 Electricians versus the general population, Denmark, mortality rate 1987-1995, men

Exposure	#Death	RT	MR	Model 1	Model 2	Model 3	Model 4
				MRR (95%CI)	MRR (95%CI)	MRR (95%CI)	MRR (95%CI)
Not electrician	44,117	10,033,289.7	439.7	1 (ref)	1 (ref)	1 (ref)	1 (ref)
Electrician only year 0	70	13,394.7	522.6	1.90 (1.50-2.40)	1.80 (1.42-2.27)	2.17 (1.62-2.91)	1.91 (1.51-2.41)
Electrician only year 2	25	9,649.5	259.1	0.90 (0.61-1.34)	1.12 (0.75-1.65)	1.08 (0.67-1.73)	2.03 (1.59-2.59)
Electrician year 0 and 2	196	106,846.9	183.4	0.60 (0.52-0.69)	0.77 (0.67-0.89)	0.80 (0.68-0.94)	0.67 (0.59-0.77)

RT, risk time - person years of risk; MR, mortality rate per 100,000 person-years; MRR, mortality rate ratio; 95%CI, 95% confidence interval.
Model 1: Adjusted for age (5-year groups) and calendar year.
Model 2: Adjusted for employment status, incapacity benefits, sick leave and unemployment in year 1, age (5-year groups) and calendar year.
Model 3: Only persons with employment status = 1 in year 2 were included. Adjusted for employment status, incapacity benefits, sick leave and unemployment in year 1, age (5-year groups) and calendar year.
Model 4: Marginal structural model with weights estimated as described in the Methods section. Adjusted for age (5-year groups) and calendar year.

ISSN: 1471-2458