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

BMC Public Health

Table 6 Electricians versus carpenters and brick layers, 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	738	244,977.7	301.3	1 (ref)	1 (ref)	1 (ref)	1 (ref)
Electrician only year 0	70	13,394.7	522.6	0.99 (0.75-1.30)	1.15 (0.87-1.53)	1.39 (0.95-2.04)	1.20 (0.92-1.57)
Electrician only year 2	25	9,649.5	259.1	0.50 (0.32-0.77)	0.52 (0.33-0.81)	0.46 (0.27-0.79)	0.49 (0.32-0.76)
Electrician year 0 and 2	196	106,846.9	183.4	1.06 (0.89-1.25)	1.24 (1.04-1.48)	1.17 (0.96-1.43)	1.30 (1.11-1.53)

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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