Patients have a better chance of surviving life-threatening injuries if they're treated at a Level I trauma center than a Level II trauma center, according to a study by local experts. Patients whose injuries were caused in car crashes, fires or criminal activity might not know the difference between the two, but trauma experts say the data suggest that outcome can depend on where they are taken. The authors credit the better Level I outcomes to the increased patient volume - at least 1,200 admissions a year - required of such centers.