另外，能借用循证医学的思路和方法，或引入高等统计学，如多变量分析技术等方法；
In addition, to borrow ideas and methods of evidence-based medicine, or the advanced statistics such as multivariate analysis and other methods;
方法用寿命表分析，单变量和多变量分析等统计学方法分析各种危险因素对预后的影响。
Methods The influences of various risk factors on the prognoses were analyzed by life table, single or multiple variable analysis.
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