Statistical Analysis of the National Crash Severity Study Data

NHTSA - Behavioral Safety Researchhttps://doi.org/10.21949/15250431980PDFStatistical ReportGimotty, Phyllis A.Campbell, Kenneth L.Chirachavala, ThipataiCarsten, OliverO\u2019Day, JamesUniversity of Michigan. Highway Safety Research InstituteUnited States. National Highway Traffic Safety AdministrationUnited States. National Highway Traffic Safety AdministrationUnited StatesDriversStatistical analysisAccident analysisCrash injury researchAccident severityGuides to informationDOT-HS-805-561UM-HSRI-80-38NTIS-PB81124679DOT-HS-8-01944Hedlund, JamesFinal reportThis is the Final Report on a two-year statistical analysis of the data collected in the National Crash Severity Study (NCSS). The analysis presented is primarily concerned with the relationship between occupant injury severity and the crash conditions. Statistical models were developed to relate the probability of a severe injury to independent variables such as Delta V (the instantaneous change in velocity of the vehicle) and Occupant Age. Models were developed separately for various subsets of front and side impacts. The area of population statistics was also studied. Design effects and variances were estimated for the aggregate NCSS data. Subsamples of both fatal and non-fatal cases with missing data on key variables were examined. This work supplements the separate publications of NCSS Statistics for passenger cars and for light trucks and vans. These publications present descriptive statistics on the accidents, vehicles, occupants and their -injuries for the aggregate NCSS data. Various clinical studies which were reported separately, are summarized in this report. 'These studies address the existing literature, side impacts, lower extremity injuries, eye injuries, and neck injuries. The application, of the NCSS data to accident analysis models, which estimate the benefits of improved occupant protection systems, is also discussed. /Abstract from report summary page/129