A study was undertaken to estimate the number of people with higher brain dysfunction due to neurological disease in the Tokyo metropolis and to determine the rate at which the various neurological diseases account for such disabilities. We designed a questionnaire that was sent to 372 medical institutions and welfare factories in the Tokyo metropolis. The questionnaire was designed to identify patients admitted to these institutes between 18 October and 24 October 1999 with one of 10 neuropsychological syndromes including aphasia, amnestic syndrome, neglect syndrome, topographical disoritentation, agnosia, limb apraxia, attention disorder, executive dysfunction, emotional disorder and others. The questionnaire was to be filled out and a manual was provided with definitions and descriptions to assure accurate and consistent reporting. The survey did not include individuals with dementia or unstable syndromes. Of all the institutions contacted, 251 (67.7%) responded; 1, 234 cognitively disabled persons were reported comprising 841 men and 393 women with a mean age of 52.5 years. Cerebrovascular disorders predominated (983 persons); traumatic brain injuries were second (124 persons). The most common syndrome was aphasia (679 cases); attention disorders were second (356 cases). Higher brain dysfunction was calculated to occur in 51.3 individuals per 100, 000 population, and the number is estimated to be 4, 177 persons in the Tokyo metropolis.
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