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1 The International Society for the Study of Individual Differences (ISSID) was founded in 1983 to foster research on individual differences in temperament, intelligence, attitudes, and abilities.
Injury Severity Score. The Injury Severity Score (ISS) is an established medical score to assess trauma severity. It correlates with mortality, morbidity and hospitalization time after trauma. It is used to define the term major trauma. A major trauma (or polytrauma) is defined as the Injury Severity Score being greater than 15.