Plant, Demographics and Workforce Exposure Risk Groups The plant, a new large modern facility with extensive engineering controls, was built to produce TDI-based polyurethane foams for home furnishings and related uses. Demographic and workforce characteristics of the initial 49 workers who were hired and enrolled, the 37 workers remaining at one-year follow-up in the study, and the 12 workers lost to follow-up are summarized in Table I. No new employees were enrolled during this time period. At baseline, the workers were predominately male (69.4%), middle-aged (mean 39 years)