The National Trauma Data Bank® (NTDB®) is the largest aggregation of U.S. trauma registry data ever assembled. Participation is voluntary and is one of the leading performance improvement tools of trauma care. You will find the operational definitions for the NTDB in the National Trauma Data Standard (NTDS) Data Dictionary, which is designed to establish a national standard for the exchange of trauma registry data. Registry data that is collected from the NTDB is compiled annually and disseminated in the forms of hospital benchmark reports, data quality reports, and research data sets.