Our study findings are based on a census of all fatal work-related deaths in the U.S. identified from multiple source records. Dating back to 1992, these data have been collected using a standard methodology for sufficient time to enable assessment of trends. However, for a variety of reasons, such trend analyses need to be viewed in the context of certain limitations. While the basic methodology and structure of the CFOI data have remained constant, several primary coding systems used to classify the data have changed substantially over the past two decades. For some code systems, we adjusted the case definition for our study to reduce the impact of differences (e.g., including selected vehicles, such as tractors, with machines).