The MTS registry can collect and report on over 200 data points related to a single trauma event. The Hub team based at Waikato manages this data ensuring rigorous data quality standards are applied so that reporting is comprehensive and robust.


Term Description
Event An event refers to the occurrence of a single injury incident
Admission An admission refers to a period of occupancy of a patient in an inpatient bed excluding Emergency Department
Expected Expected calculations are based on population demographics supplied by Statistics New Zealand to District Health Boards
Incidence Incidence rates of injury are calculated as events per 100 000 people per year resulting in hospital admission
Length of Stay (LOS) The length of stay of a patient is the length of time from admission date to final discharge date
Mechanism The mechanism is the means by which injury occurs. E.g. road traffic crash (RTC)
Observed Observed is the analysis based on the data in the MRTS registry
Population demographics The population demographics of the hospital have been used as a comparison
Outcome Outcome is alive or dead at discharge
Severity The Injury Severity Score (ISS)1 2 is calculated from Abbreviated Injury Scale (AIS) for single injuries 3 4 5. A score of greater or equal to 13 is reported as a major trauma case a score of less than 13 is reported as a minor trauma case. AIS is the international standard for injury scoring.
Trauma Injury Severity Score (TRISS) The TRISS is the predicted probability of survival. This is calculated for major trauma events.
Type of injury Blunt Penetrating or Burn

1 Baker SP, O'Neill B, Haddon W, Long WV, The Injury Severity Score: Development and Potential Usefulness, Proceedings, Association for the Advancement of Automotive Medicine 18: 58-74, 1974. Baker SP, O'Neill B, The Injury Severity Score: An Update, J Trauma 16: 882-885, 1976. 3 Rating the severity of Tissue Damage. The Abbreviated Injury Scale, JAMA 215(2):277-280, 1971. Petrucelli E, States JD, Hames LN, The Abbreviated Injury Scale: Evolution, Usage and Future Adaptability Accid. Anal.& Prev. 13: 29-35, 1982. Champion HR, Copes WS, Sacco WJ, et al. The Major Trauma Outcome Study: Establishing National Norms for Trauma Care, J Trauma 30 (11), 1356-1365, 1990.

Inclusion and exclusion criteria


  • Admission to an MTS in-hospital bed as a result of, and within 7 days of injury.
  • Death in hospital following injury (including deaths in the emergency department)


  • Trauma patients seen and discharged from the emergency department (including those that were trauma called)
  • Injuries attributable to documented pathological processes such as osteoporosis, osteopenia, metastatic disease, etc
  • Isolated peri-prosthetic fractures
  • Exertional injuries: e.g. tendon rupture not associated with external force
  • Hanging, drowning without evidence of anatomical injury
  • Poisoning
  • Foreign bodies that do not cause anatomic injury
  • Patients admitted primarily for pre-existing medical conditions e.g. epilepsy, syncope, Parkinson’s, etc. who are not admitted directly as a result of their injuries, e.g. syncope / collapse causing laceration to forehead.