Objects ： The authors analyzed retrospectively 64 cases of head injury referred from the court, caretaker, or insurance company with the purpose of evaluation of mental disability. Premorbid chararcteristics, information about accidents, information about assessments, psychopathology, KWIS and MMSE score and factors affecting the result of assessment were studied. Methods ： We collected data through patient’s hospital record and expert opinion in writing. 1) The incidence of head injuries tended to be high in male, socially-active age group and laborers. 2) Automobile accident was the most common cause of the brain injury. 3) The time interval from accident to assessment of the disability was more than 1 year in many cases. And distribution of the results of assessment were very wide from 0% to 100%. The mean result of the assessment was 36.16 土 24.48%. 4) Memory impairment was the most common symptom of head injury patients and was followed by headache/dizziness, apathy, and irritability. 5) There were statistically significant differences in the mean scores of MMSE total and many subtest scores among three disability result groups. There were statistically significant differences in mean scores of full scale and several subtests of KWIS between high disability evaluation group and low and moderate disability evaluation groups. 6) Three were statistically significant differences in MMSE total score, and many subtests between dementias and organic personality disorder and organic mental disorder, NOS patients. There were statistically significant differences in mean scores of full scale and several subtests of KWIS between dementias and organic personality disorder and organic mental disorder, NOS patients. 7) Language and praxis in MMSE and diagnosis were the most important factors affecting the result of assessment.
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