The authors reviewed the medical records of 6,565 neuropsychiatric inpatients admitted to the neuropsychiatric wards of Hanyang University Hospital during the eleven years( 1981 —1991). Clinical characteristics were evaluated and discussed with special reference to their diagnostic distribution and elderly patients. The results of this study were compared to the previous study Kim KI et al(1982) from 1975 to 1980. Schizophrenia was diagnosed in 26.4%，neurosis in 22.1 %，affective disorder 17.3 %，personality disorder in 6.9%, and alcoholism and related psychosis in 6.0%. Contrast to previous study, diagnostic frequency of schizophrenia has gradually increased from 22.3% in 1981 to 35.0% in 1991, but there was no significant change in affective disorder. Diagnostic rate of neurotic depression and epilepsy declined significantly, and that of posttraumatic stress disorder and alcoholism and related psychosis rose significantly. As to sex ratio, there were more men in alcoholism and related psychosis, organic brain syndrome, epilepsy, senile psychosis, and more women in neurosis, affective disorder, and addiction. Compared to previous study, the sex ratio has reversed in addiction, mental retardation, and senile psychosis. For age distribution, 63.4% of all cases were in age group between 16 and 39. For educational status, 69.1 % of all cases were high school or college graduates. Electroconvulsive therapy has conducted in 1.1% of all cases ; 4.1% of schizophrenics and 0.4% of affective disorders. Compared to previous study, the declining trend of ECT appeared more definitely. The admission rate of patients of over 60 years old has increased gradually and their average admission rate was 5.4%. Compared to 60 year old and over rate in general population, the rate of the admitted elderly patients rose more rapidly than of general population
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