Objectives: To investigate outcome in children with mild traumatic head inj
ury (THI) at 1 week and 3 months postinjury and to identify factors associa
ted with persisting problems. Design: Postconcussional symptomatology, beha
vior ratings, and neuropsychological test performance mere examined at 1 we
ek and 3 months postinjury. Setting: Participants were recruited from succe
ssive presentations to emergency departments of two major hospitals. Partic
ipants: 130 Children with mild THI were compared with 96 children having ot
her minor injuries as controls. Results: Children with mild THI experienced
headaches, dizziness, and fatigue but exhibited no cognitive impairments,
relative to controls, at 1 week postinjury. By 3 months, symptoms had resol
ved. However, 17% of children showed significant ongoing problems. They wer
e more likely to have a history of previous head injury, learning difficult
ies, neurological or psychiatric problems, or family stressors. Conclusions
: Persisting problems following mild head injury in children are more commo
n in those with previous head injury, preexisting learning difficulties, or
neurological, psychiatric, or family problems. These "at-risk" children sh
ould be identified in the emergency department and monitored.