Table 1 Case Mix Factors

1. Date of admission

2. Age

3. Sex

4. Mechanism of injury

5. Type of trauma (blunt/penetrating)

6. Systolic blood pressure on arrival in primary hospital

7. GCS on arrival in primary hospital

8. Whether transferred from another hospital (yes/no)

9. Injury Severity Score

Abbreviated Injury Scale (AIS) severity in the 9 body regions:

10. Head AIS

11. Face AIS

12. Neck AIS

13. Chest AIS

14. Abdomen AIS

15. Spine AIS

16. Upper limbs AIS

17. Lower limb AIS

18. External region AIS

Co-morbidity factors:

19. Coronary artery disease (yes/no)

20. Hypertension (yes/no)

21. Non-insulin dependent diabetes mellitus (yes/no)

22. Psychiatric illness (yes/no)

23. Seizures (yes/no)

24. Stroke (yes/no)

25. Asthma (yes/no)

26. Drug abuse (yes/no)

27. Alcohol problem (yes/no)