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采用“巢式”病例－对照研究（Ｎｅｓｔｅｄｃａｓｅ－ｃｏｎｔｒｏｌｓｔｕｄｙ）方法，１∶１配对。以肠线虫感染为指标，评价三缸厕所的防病效果，并对５个混淆因素进行了分析。结果表明，粪便未经无害化处理的相对危险性（ＯＲ）为１．９７（Ｐ＝０．０２），归因危险度比的估计值λ为０．０８６。说明在农村使用三缸厕所作为粪便无害化处理对肠线虫感染具有一定的预防作用。因素分析结果表明，务农职业、文化程度低、饭前便后不洗手、喜生食等人群，其ＯＲ值分别为２．２１、２．８９、９．２３、２．９５，在统计学上均具有显著性意义
A “nested” case-control study (1: 1) was used. The intestinal nematode infection as an indicator to evaluate the prevention effect of three-cylinder toilets, and five confounding factors were analyzed. The results showed that the relative risk (OR) of excrement without detoxification was 1.97 (P = 0.02), and the estimated value λ of the hazard ratio was 0.086. This shows that the use of three-cylinder toilet in rural areas as a safe manure treatment of intestinal nematode infection has a certain preventive effect. The results of factor analysis showed that the odds ratios for the jobs of farming, low education level, not washing hands before meals and after meals, and eating hi people were 2.21, 2.89, 9.23 and 2.95, respectively, statistically Has significant significance