分层分析方法在学校卫生学研究中的应用

在病例—对照研究中,有些未被控制的因素在一般x~2检验中,有可能掩盖研究因素与结果的真实联系性,而成为结果判定的混杂因素。在调查设计阶段未被控制的因素,在资料分析阶段有些混杂因素可通过适当的分析方法加以控制。其方法之一就是分层分析(Mantel-Haenszel分析方法)。其原理是将混杂因素同等分布于病例组和对照组,使之对病例和对照产生相同的影响,然后用分层x~2 M-Ⅱ检验。在分析因素不太多的情况下,此方法是较为便利的,它适用于有无混杂因素的两种情况。

Stratified Analysis Method Used in School Health Research

In the case-control study with common X-test, some factors uncontroled in design would cover the real relation between research factors and results. These factors are called confounding factors which may affect the judgment. Some confounding factor can be controled in analysis stage with suitable method. One of the methods is stratified analysis method (Mantel-Haenszel X-test). Its principle is hat these confounding factors are equally distributed between case group and control group, then stratified analysis method can be used. If there aren't a lot of research factors in the study, stratified analysis method is more convenient for the disease affected with multiple factors. It can be both used in the material that has or hasn't confounding factors.