Biometeorologic Studies on Cerebrovascular Diseases : II. Seasonal Observation on Effects of Meteorologic Factors on the Death from Cerebrovascular Accident

Abstract

In order to clarify the seasonal difference in meteorologic effects on the deaths from cerebrovascular accidents and to evaluate ecological factors closely associated with it, the present study was accomplished on 1, 075 deaths from cerebral hemorrhage and 527 from cerebral infarction which occurred in Nagoya, 1965. Low air temperature, low temperature-humidity index and low MISSENARD'S effective temperature in spring; high air temperature and its increase, low relative humidity and high temperature-humidity index in summer; increasing atmospheric pressure in autumn; decreasing atmospheric pressure in all seasons and many other meteorologic factors were revealed as the definitely contributing factors to the deaths. The effects of the variations of air temperature gradient and of relative humidity gradient on the deaths were also recognized. The importance of the indoor temperature especially in winter and of ecological factors such as clothings and dwelling conditions were emphasized. And it was concluded that the control of meteorological factors in every season would furnish an effective preventive measure against cerebrovascular accidents.