[Epidemiology of stroke in urbans and rural areas of China: an analysis of stroke mortality rates in 1986].

This paper reported the stroke mortality rates in China in 1986.5 790,864 people from 199 locations sampling from all parts of China (the Taiwan province un-investigated) were investigated and 4,446 cases of death were found. The mortality rate was 76.78 per 10(5) people and its 95% CI was 74.42-79.04/10(5). The mortality rate adjusted using population composition of the cities and rural areas of China in 1986 was 77.15/10(5). The mortality rate standardized by direct method use in the China population in 1982 was 57.25/10(5) and the mortality rate standardized use in the world standard population was 80.94/10(5). The mortality rates of the great regions and provinces were counted respectively, and the relationship between the mortality rates and the geographical locations were analyzed in the correlation and the regression. It was found that there were a relationships of positive correlation and liner regression between the mortality rates and the latitude degree and the longitude, that was to say, the mortality rates increased gradually from south to north and decreased progressively from east to west in China. The stroke mortality rates in the cities were higher than in the rural areas, and in the city districts higher than in its outskirts in the big cities. Then the distribution of case number in months was analyzed using the methods of the test for trend and circular distribution, a peak of that was significantly in the statistics was found in January although it was not very high. The stroke mortality rates were gradually arose as age increasing, and the relationship between the mortality rates and age may be fitted with the logistic curve.