The aim of the study is to correlate the injuries observed in accident occurrences to the mathematically determined loading factors in order to review the protection criteria to date for vehicle occupants subjected to sagittal loading and, if required, to provide new criteria in this connection. In this way, biomechanics research as practised up to now is extended by "statistical biomechanics" using the "Equivalent Accident Characteristics" method (EAC method): the results obtained from accident analysis and from mathematical, experimentally supported simulation are linked to each other while eliminating the equivalent accident characteristic according to statistical criteria so as to show a relationship between the degree of severity of injuries specific to certain parts of the body and the mechanical loading values.