The purpose of this research is to test the usefulness of the Traditional Epidemiological Theory of disease causation in modeling the effects of work environment characteristics on occupational injury and illness rates. More specifically, the research will use the agent, host, and environment constructs of the Traditional Epidemiological Model to examine the effects of the following six employer health and safety practices on occupational injury and illness rates: (1) the formation of a company labor union, (2) the utilization of industrial hygiene services within the past twelve months, (3)...