利用症状者检查作为肺结核患病率调查方法的研究

目的　建立一个新的肺结核病涂阳患病率调查方法及其推算公式。方法 利用肺结核可疑症状者与无肺结核可疑症状者涂阳病人数构成比的参数作常数,建立直接症状检查法及其推数公式,并作费用分析。结果 (1)有肺结核可疑症状者与无结核症状者的涂阳病人比例,分别为 75%和25%。以此参数建立的(直接症状检查法 )肺结核涂阳患病率计算公式为:R=Sn×(1+1/3)N。R为肺结核涂阳患病率；Sn为有症状者患病人数；N为调查人数。(2)直接症状检查法调费用低,仅为普查法的24 .3%。结论 新建立的直接症状检查法样本大、参数(常数)稳定、科学性好、调查方法简便、实施工作费用低,可作为今后的肺结核患病率调查方法。

Research of method for tuberculosis epidemiology survey

Objective To establish a new method and calculat ing formula for estimation the prevalence of smear positive tuberculosis. Methods To use the parameter of the smear positive tuberculosis patients between patients who with suspect sympotoms and who without suspect sympotoms for establishing the new estimation method.Results (1)The proportions of the smear positive tuberculosis patients who with suspectsy mpotoms and without suspect sympotoms was 75% and 25% respectively in the 4th TB survey. The formula was established by parameter is:R=Sn×(1+1/3)/N,R is preval ence of smear positive tuberculosis; Sn is the number of smear positive tubercul osis patients who with suspect sympotoms detected in a survey that just focus on TB suspects or screening and examination；N is the number of TB suspects examin ed in the survey.(2)The cost of the survey is lower than routine method. Conclusion The new method is a scientific, simple and convenient, low cost. The method and formula can be used for survey of prevalence of sputum smear positive pulmonary tuberculosis.