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在医院感染危险因素的研究中，有些研究者往往忽视了混杂偏倚的存在，本文选出两篇有关论文就其混杂偏倚问题进行分析，并列出了控制混杂偏倚的几种主要方法，提醒研究者注意预防和控制混杂偏倚
In the study of risk factors of nosocomial infection, some researchers often neglected the existence of hybrid bias. In this paper, two related papers were selected to analyze their hybrid bias and several main methods to control the miscibility were promulgated to remind researchers Attention to prevention and control of miscellaneous bias