Brain Injury Research Abstract & Link:

Returning to work within the first seven years of severe head injury 
The rate and prediction of return to work was examined in 98 severe head injured patients during the first seven years after injury. The employment rate dropped from 86% before injury to 29% after. Younger patients, and those with technical/managerial jobs before injury were more likely to return to work than those over 45 years of age, or in unskilled occupations. Physical deficits were not related to return to work, but the presence of cognitive, behavioural, and personality changes was significantly related to a failure to return to work.