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Differences in hospitalizations between employment industries, Finland 1976 to 2010
Lauri Kokkinen1, Anne Kouvonen2, Aki Koskinen1
1Centre of Expertise for the Development of Work and Organizations, Finnish Institute of Occupational Health, Tampere and Helsinki, Finland.
Purpose:
The aim of this study was to investigate the differences in hospitalizations between different industries in the Finnish working-age population between 1976 and 2010.
Methods:
Participants (n = 3,769,355) were randomly selected from seven independent consecutive national cohorts in the Statistics Finland population database, each representing a 25% sample of the working-age (18-65-year-old) population. These data were linked with diagnosis-specific records on hospitalizations, drawn from the National Hospital Discharge Registry (mean follow-up time per cohort was 4.1 years) using personal identification numbers.
Results:
Sociodemographics-adjusted models showed differences between the proportional hazard ratios of employment industries in all-cause hospitalization. These differences remained fairly stable (hazard ratio [HR], 0.95-1.24) throughout the 35-year period. The differences between industries varied the most in hospitalizations for mental disorders. These differences were substantial during 1976 to 1980 (HR, 1.16-2.29), decreased considerably and remained moderate between 1981 and 2000 (HR, 0.92-1.64), and then increased notably between 2001 and 2010 (HR, 1.09-2.34).
Conclusions:
The cause-specific hospitalizations of different employment industries have varied, but the differences in all-cause hospitalizations have remained fairly stable, with the ranking among industries remaining almost the same over the past 35 years.
