Background & Aims: Evaluation of trauma management is usually by TRISS scoring and the outcome is compared to data from Major Trauma Outcome study (MTOS). Same study was designed in Urmia.

Materials & Methods: TRISS scoring was performed for multiple trauma cases during April2005-March 2006 in Shahid Motahhari hospital and was compared to MTOS via W-M-Z statistics.

Results: 260 consecutive patients were included in the study, 210 men and 50 women. Mean age was 30.31 yr. 91% sustained blunt trauma, the vast majority resulting from traffic accident (92.5%). Observed mortality was 52 and predicted mortality 42. The W-M-Z statistics were: s 3.8%-0.891-0.27.

Conclusion: The value of M- statistic > 0.880 predicted that this study was comparable to MTOS data. Z statistic between ranges -1.96- +1.96 defined standard treatment and there was no significant mortality difference. TRISS scoring and MTOS�comparing are valid for multi-trauma patients, outcome analysis in Iran.