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Table 6 Comparison between the actual percentage of survivors with the predicted percentage of survivors calculated by TRISS.

From: Evaluation of the criteria for angiotomography indications in the diagnosis of carotid and vertebral arterial injury associated with blunt trauma

Group n Death (actual) Survival (actual) Probability of survival (Average TRISS) Z p-value
Without carotid and vertebral artery injuries (Group I) 77 18.18% 81.82% 83.97% 0.34 0.7318
With carotid and vertebral injuries (Group II) 23 30.43% 69.57% 67.30% 0.01 0.9928