The highest-velocity injuries tend to have the worst associated damage.[7] A study published in 1991, which documented 314 individuals who had suffered penetrating cranial injuries caused by gunshot wounds, found that 73% succumbed to their injuries at the scene of the incident, and a further 19% ultimately died later, thus indicating a total mortality rate of 92%.[2] Perforating injuries have an even worse prognosis.[2]