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本文应用集中度对贵阳分局1976～1997年22年中的13种乙类传染病发病时间、构成特征进行统计分析，现将结果报告如下。资料与方法1．资料来源于是阳分局历年疫情资料，人口来源于分局主管部门，采用年平均人口数。2利用1976～1997年各种传染病月份发病数及历年平均人口数计算各?
In this paper, the concentration of Guiyang Branch from 1976 to 1997 22 years of 13 kinds of infectious diseases B incidence of time, the composition of statistical analysis, the results are reported as follows. Data and methods 1. Data are from the historical data of Yang Branch, the population comes from the branch department, using the average annual population. 2 Using the monthly incidence of various infectious diseases from 1976 to 1997 and the average population over the years to calculate each?