A consecutive unselected series of 1812 children (up to 15 years old) admitted for head injuries over a period of 8.5 years was studied. The cases were divided up according to five categories of pathology: benign injury, extradural haematoma, subdural haematoma, open brain laceration and brain contusion in a broad sense. All cases of benign injury were from the Geneva area (57000 children) and 52% of the cases of severe injury were referred from other places. To these 1812 cases were added those of 23 children who died before admission recorded by the police. In the Geneva area the mortality was 6.8/100,000 per year. Patients were divided into three age groups: I (0-3 years), II (3-9 years), and III (9-15 years); group I was further subdivided into subgroups I a (0-1 year) and I b (1-3 years). The incidence of each type of accident was calculated for each age group, separately for girls and boys. Each type of pathology was correlated, sex by sex and for different ages, with the type of accident. Overall, two boys were injured for each girl. Road accidents were responsible for 15% of head injuries in group I girls, 17% in group I boys, 43% in group II girls, 45% in group II boys, 50% in group III boys and 61% in group III girls. They were responsible for 94% of all deaths and 85% of deaths of hospitalized patients. Falling was the most frequent cause of injury. Benign injuries were more frequent in group I. Only 1 of 25 patients with extradural haematomas died, and there were only 8 patients with subdural haematomas, 4 in subgroup I a (babies aged less than 1 year).

A consecutive, unselected series of 1812 cases of head trauma in children less than 15 years of age and admitted hospital over a period of 8.5 years was studied. Data concerning the grade of energy involved, the ages of the victims, the types of pathologies caused and the clinical features noted were collected and statistically analysed. Babies and toddlers (0-3 years) were shown to sustain rather low-energy trauma and suffer more skull fractures, more subdural haematomas and more benign injuries. They lost consciousness less frequently and were less frequently in coma than the other children. By contrast, they had more frequent signs of lateralization, and early seizures were much more frequent in babies than in other children. Young children (3-9 years) had rather higher-energy accidents, frequently lost consciousness, were more frequently in coma and have more frequently had a free interval associated with the development of brain swelling. They did not suffer subdural effusion or contrecoup lesions. Schoolchildren (9-15 years) were statistically more or less like young adults: the clinical sequences of trauma were more severe than in the other children, mortality was a little bit higher, the risk of extradural haematoma was higher, and they rarely suffered subdural haematomas or contrecoup lesions. Traffic accidents, with higher energy involved, were more severe.

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