부산대학교 도서관

We made a clinical and statistical evaluation on the occurrence of acute myocardial infarction regarding the relation between the occurrence and meteorology in the cold inland area of Japan (Asahikawa District) for the past 10 years (1976-1985) .Monthly fluctuation of occurrence was not found to be statistically significant in the total of 581 cases. The maximum and the minimum meteorological temperatures of the investigated 10 years were graded in every 5°C, and the expected frequency of the occurrence was calculated in proportion to the percentage of each graded temperature. The expected frequency was compared with the real frequency of the occurrence by means of chi square test, and there was no significant difference of these two frequencies.A cold period in Asahikawa District was defined in this study as the term while ordinary mean atmospheric temperatures were below 0°C (from 7 Nov. to 16 Apr.) . In the 10-years' cold periods, there happened 269 cases of acute myocardial infarction, and 245 days were proved to be the days with occurrences. According to the data by the Meteorological Observatory, 10 meteorological items were selected.Canonical discriminant analysis was applied to the 10 meteorological items between the 245 days with occurrences and control 245 days without occurrences in the cold periods of the investigated 10 years, and between the 37 days with outdoor occurrences and control 37 days without occurrences. The F values of 0.0003 and 0.0155 in the above canonical discriminant analysis were respectively small (<< F19 (0.25) =1.51) . Therefore, the 10 meteorological items could not discriminate the probabilities between the days with occurrences and the days without occurrences of myocardial infarction in the cold periods in Asahikawa District.