Papers in Meteorology and Geophysics
Online ISSN : 1880-6643
Print ISSN : 0031-126X
ISSN-L : 0031-126X
Recent Changes in Seasonal Variation of Senile Mortality
Masako Momiyama-SakamotoKunie Katayama
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JOURNAL FREE ACCESS

1975 Volume 26 Issue 4 Pages 181-197

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Abstract

In the preceding report on t h e seasonal variation of deaths from cerebrovascular diseases, the writers reported that mortality from cerebral thrombosis and embolism, more frequent than cerebral haemorrhage among the aged, picks up in summer in districts where temperature exceeds 24°C in the hot months. It is further studied in this report whether such a summer upcurve is seen only for this senile ailment or for others as well, such as heart disease, tuberculosis, pneumonia-bronchitis, and malignant neoplasm of stomach.
1. The p h enomenon in which mortality declines along with the rise of temperature but turns upward in the summer season is witnessed for all these diseases but malignant neoplasm. Deaths from the last named cause occur differently.
2. The s e asonal variations of deaths from cerebral thrombosis and embolism can roughly be classified in form according to regional climatic conditions. It is found, however, that mortality increases in summer for chronic rheumatism in those areas where no pickup is recorded in the hot months for cerebral thrombosis and embolism, and that the summer peak is much higher for tuberculosis than for this cerebral disease. That mortality resumes an upturn in summer is not a phenomenon confined to the senile disorder but one greatly dependent upon socio-economic conditions in some regions of the country.
3. As for pneumonia- b ronchitis, this phenomenon appears more conspicuously for infants than for other age groups. On the other hand, the winter peak of mortality is now a little lower for infantry and old people, but it was formerly much higher and then has fallen off to the present level thanks probably to the improvement of room heating facilities in the cold months, indicative of the future possibility of deseasonalization at least for infant mortality.

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© by Japan Meteorological Agency / Meteorological Research Institute
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