One 9-year (19791988) review of fatal dog attacks in the United States determined that, of the 101 attacks where breed was recorded, pit bulls were implicated in 42 of those attacks (41.6%).[36] A 1991 study found that 94% of attacks on children by pit bulls were unprovoked, compared to 43% for other breeds.[37] One 5-year (19891994) review of fatal dog attacks in the United States determined that pit bulls and pit bull mixed breeds were implicated in 24 (28.6%) of the 84 deaths where breed was recorded.[38]
One 15-year (19912005) review of dog attack fatalities investigated by the Kentucky Medical Examiner determined that pit bulls were implicated in 5 of the 11 fatal attacks (45.4%).[39] Another 15-year (19942009) review of patients admitted to a Level I Trauma Center with dog bites determined that pit bulls were involved in most of these attacks: of the 228 patients treated, the breed of dog was recorded in 82 attacks, and of these, 29 (35%) attacks were attributed to pit bulls. All other dogs combined accounted for the remaining 65% of attacks.[40] In 44.8% of the attacks, the dog belonged to the victim's family.[40] The authors state:
Attacks by pit bulls are associated with higher morbidity rates, higher hospital charges, and a higher risk of death than are attacks by other breeds of dogs. Strict regulation of pit bulls may substantially reduce the US mortality rates related to dog bites.[40]
One 5-year (20012005) review of dog attack victims admitted to the Children's Hospital of Philadelphia determined that pit bull terriers were implicated in more than half of bites. Of the 551 patients treated, breed was identified in 269 cases. Of these 269 patients, 137 (50.9%) were attacked by pit bulls.[41] The authors write:
...the overwhelming number of bites involving pit bull terriers in this study and others certainly has some degree of validity when it comes to identifying bite-prone breeds. Pit bull terriers, German shepherds, and Rottweilers were the offending breeds implicated in our study and have accounted for the majority of dog bites according to other investigators.[41]
One review of the medical literature found that pit bulls and pit bull cross-breeds were involved in between 42 and 45% of dog attacks.[42] Fatalities were most often reported in children, with 70% of victims being under the age of 10.[42]