The purpose of the present study was to look at possible gender differ
ences in outcome after severe traumatic brain injury. Three hundred an
d thirty four consecutive patients, 72 females and 262 males, age rang
e 5-65 years, were included in the study. Age range and severity of in
jury, evaluated by duration of unconsciousness, did not differ between
male and female patients. Predicted outcome at the time of discharge
from an in-patient rehabilitation programme was evaluated according to
work capacity. Female TBI patients had a better predicted outcome (p
< 0.015). It is suggested that progesterone, acting as a neuroprotecti
ve agent, may explain this difference in outcome.