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二、调查资料的概要分析(一)发病率及其与各月发病动态的关系:某校学员自1959年迄1962年春先后发生肝炎总计518例,其中确诊患者338例,可疑患者180例。1959年全年在校四个队的发病率皆在20%上下,且皆在5、6月呈现突出明显的发病升高。1960年全年在校学员共6个队,其年发病率为3-6%者4个队,8-10%者2个队;1961年全年在校学员共9个队,其年发病率为3-6%者5个队,8-10%者2个队,20%左右者2个队。以各队月发病变动情况与其年发病率相比较,发现凡一年内无发病升高者其年发病率约3-6%,一年有一次发病升高者其年发病率约8-10%,一年出现第二次升高或连年出现第二次升高者其年发病率为20%左右。调查发现不同的发病时间动态及发病率也正是不同发病原因的反
Second, an overview of survey data (A) morbidity and incidence of each month with the relationship: a student from 1959 to 1962 spring has occurred in a total of 518 cases of hepatitis, of which 338 cases of confirmed patients, 180 cases of suspicious patients. The incidence rates of all four teams in school in 1959 were all above and below 20%, and all of them showed outstanding and obvious increase in May and June. Six students were enrolled in the school in 1960, with an annual incidence rate of 3-6%, four teams and eight-10% of two teams. In 1961, there were nine teams of students in total, with annual incidence of The rate of 3-6% 5 teams, 8-10% 2 teams, 20% about 2 teams. The monthly incidence of each team changes compared with its annual incidence and found that no increase in incidence within one year of its annual incidence of about 3-6%, once-year incidence of increased annual incidence of about 8-10% , The second increase in one year or the second increase in successive years is about 20%. The survey found that different incidence of morbidity and morbidity is precisely the opposite cause of the disease