Background: The study investigated the relationship between the type of employment (permanent/ temporary) contract and mortality. Factors through which temporary employment was expected to be associated with increased mortality were the degree of satisfaction with the uncertainty related to temporary work situation (Study 1) and the voluntary/involuntary basis for temporary work (Study 2). Methods: In Study 1 the data consisted of representative survey on Finnish employees in 1984 (n = 4502), which was merged with register-based follow-up data in Statistics Finland covering years [1985][1986][1987][1988][1989][1990][1991][1992][1993][1994][1995][1996][1997][1998][1999][2000]. In Study 2 the data consisted of representative survey on Finnish employees in 1990 (n = 3502) with register-based follow-up data covering years 1991-2000. The relative risk of death was examined by conducting Cox proportional hazards analyses for the permanent and the two temporary employment groups, respectively. Results: In Study 1 temporary employees feeling the insecure situation unsatisfactory had a 1.95-fold higher risk of mortality than permanent employees (95% CI 1.13-3.35) after adjusted for background, health-and work-related factors. In Study 2 employees in the position of having a temporary job on the involuntarily basis had a 2.59-fold higher risk of mortality than permanent employees (95% CI 1. 16-5.80). Conclusions: The present study confirmed that temporary employees are not a homogeneous group, which holds true even for mortality. Those temporary employees, who either felt the insecure situation unsatisfactory or who worked in temporary work involuntarily, had higher risk of mortality than permanent employees.
Introduction
There is a considerable amount of evidence showing that unemployment is associated with increased mortality and morbidity.1-4 However, no agreement exists as to whether the health and well-being of the employed population are unevenly distributed between permanent and temporary employees. Temporary employment can be defined as paid employment relations other than those with unlimited duration, including fixed-term contracts as well as work done on call and through temporary-help agencies. 5 In Finland, the proportion of temporary employees increased from 11% in 1984 to 15% in 1990 and 18% in 1997. Since then the proportion of temporary work has stabilized. In comparison with Europe, the proportion of temporary work in Finland (16%) is above the average (14% in 2004).There are several potential factors through which temporary employment can be a health risk. For example, job insecurity, deficient benefits, work strain and exposure to hazardous work conditions have been suggested as such pathways. [6][7][8][9] In addition, the motive for doing temporary work-specifically if it is involuntary, i.e. not based on an employee's own choice-has been related to negative health outcomes.10 A recent meta-analysis across 27 studies by Virtanen et al.
11suggests higher psychological morbidity (distress) among temp...