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

BMC Public Health

Table 5 Electricians versus the construction industry, 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	2,571	629,336.2	408.5	1 (ref)	1 (ref)	1 (ref)	1 (ref)
Electrician only year 0	70	13,394.7	522.6	1.13 (0.89-1.45)	1.29 (1.00-1.65)	1.39 (1.01-1.90)	1.40 (1.12-1.75)
Electrician only year 2	25	9,649.5	259.1	0.79 (0.53-1.19)	0.84 (0.56-1.27)	0.74 (0.45-1.21)	0.82 (0.55-1.21)
Electrician year 0 and 2	196	106,846.9	183.4	0.90 (0.77-1.05)	1.01 (0.87-1.19)	0.95 (0.80-1.14)	1.18 (1.03-1.36)

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.

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