RESULTS: The actual mortality rate (27.3%) was higher than the estimated mortality rates, with the highest predicted rate of 11.3% obtained using the APACHE II. All four severity scores were significantly associated with mortality (F= 62.772, p = 0.000) and explained 83% of its variability (R2 = 0.834). However, after adjustment, only the APACHE III scoring system was a significant predictor (Beta = −0.753, p=0.000). Three scoring systems were significantly associated with mortality (F = 42.055, p = 0.000) and explained almost 70% of its variability (R2=0.712), but after adjustment, only the APACHE II was a significant predictor (Beta = −0.631, p=0.041). The combination of the severity score and mortality prediction were significant predictors of mortality (Beta = −1.397, p = 0.000 and Beta = 0.517, p = 0.036, respectively).