The LTTEp and non-LTTE groups were similar in age ( 38 years vs. 38.8 years , p = 0.75 ) , Injury Severity Score ( ISS ) ( 19.2 vs. 19.0 , p = 0.94 ) , Revised Trauma Score ( RTS ) ( 5.5 vs. 6.0 , p = 0.09 ) , lactate ( 4.2 vs. 3.6 , p = 0.14 ) , and mechanism of injury ( p = 0.44 ) .