(1) Authors studied seasonal fluctuation of psychiatric admission preliminarily, based on data of admission to Pusan area for a 4 year period of 1960-1963, and obtained following impressions. (2) The rate of admission in Pusan area and its seasonal fluctuation appear quite similar to those reported by investigators for European, American and Japanese cities. Thus the admission increases in spring and reaches the maximun in May and then gradually decreases toward the end of year. (3) The data obtained by statistical analysis of the seasonal fluctuation in Pusan area were compared with those of foreign ones in order to observe how to be related to the latitude of the locality. It is the general tendency that the lower latitude showed increase of admission in earlier months of the year than the higher latitude did. (4) It is a impression that the admission of affective psychoses are more sensitive to the climatic factors than the schizophrenics. (5) It is conjured by the authors that the sociocultural and economic factors should be considered to give an account of the seasonal fluctuation of psychiatric admission
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