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疾病的时间聚集性因病而异。同一种疾病有时由于自然,社会条件的变化而使其发病高峰时间有所漂移。本文将向量合成表示法——集中度引入流行病学,分析我县11年来6种常见传染病发病的时间、频率等变化特征,从而确定我县传染病发病的时间特点。 1 材料与方法根据我县1978～1988年的疫情资料,收集整理6种常见传染病的发病数。应用历年年平均人口,计算出各月的发病率及月发病率占全年发病率的百分比(表1),然后按式1～3计算历年各病的集中度。
The temporal aggregation of the disease varies from disease to disease. Sometimes the same disease due to changes in natural and social conditions so that the peak time of its drift. In this paper, the vector synthesis notation - concentration into the epidemiology, analysis of the county 11 years of six common infectious disease incidence, frequency and other changes in the characteristics of infectious diseases in order to determine the incidence of time characteristics. 1 Materials and Methods According to the epidemic data of our county from 1978 to 1988, collected the incidence of six common infectious diseases. The annual average population was used to calculate the incidence of each month and the monthly incidence as a percentage of the annual incidence (Table 1). Then, the concentration of each disease over the years was calculated according to the formulas 1-3.