[Objective] We quantitatively analyzed age and cause of death structure of the decline in age-adjusted mortality rates in recent years, especially since 2000, to understand future public health issues.
[Methods] We calculated age adjusted mortality rates by cause of death were nationwide from 2000 to 2015. The reference population was set as “Japanese 2015 model population”.
[Results] The age-adjusted mortality rate (per 100,000) for all causes was 1,781.3 for males and 990.6 for females in 2000, but decreased to 1,442.2 for males and 792.5 for females in 2015.
By cause of death, “malignant neoplasm”, “cardiac disease (excluding hypertension)”, “pneumonia”, and “cerebrovascular disease” contributed greatly. On the other hand, the age-adjusted mortality rate of “senility” increased, showing a negative contribution of -6.0% for males and -13.7% for females to the decrease in all-cause mortality.
[Discussion] The decline in the all-cause age-adjusted mortality rate was largely due to the fact that “cerebrovascular disease” was almost halved. In addition, the two causes of death, “cerebral infarction” and “acute myocardial infarction”, accounted for about 40% of the overall decline.
Among diseases other than “selected causes of death” (A classification of 34 causes of death that are of great social interest), “vascular and unspecified dementia,” “Parkinson’s disease,” and “Alzheimer’s disease” increased. In addition, “other respiratory diseases” classified as “aspiration pneumonia”, also increased during this period.
Although the age-adjusted mortality rate for all causes of death decreased significantly, the contribution of “cerebral infarction” and “acute myocardial infarction” should decrease, and we need to clarify the causes and take measures for these trends.
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