The risk of pneumonia increases after stroke, especially in poststroke dysphagia patients. Propensity score matching (PSM) is a statistical method in SPSS, which can be used to balance the difference between the 2 groups of known factors. Nasogastric tube feeding is an important factor of stroke-associated pneumonia. However, few studies have used PSM to eliminate the effect of confounding factor.

中文翻译：

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中风阶段对于脑梗塞后吞咽困难患者的肺炎至关重要。

中风后肺炎的风险增加，尤其是中风后吞咽困难患者。倾向得分匹配（PSM）是SPSS中的一种统计方法，可以用来平衡2组已知因素之间的差异。鼻胃管喂养是脑卒中相关肺炎的重要因素。然而，很少有研究使用PSM来消除混杂因素的影响。