Descriptive statistics and bivariate analysis were used to characterize injury patterns and multivariate analysis was used to identify factors associated with severe injury.
描述统计和双变量分析用来描述伤害类型，而多重变量分析用来确定严重伤害的相关因素。
The incidence of loss to follow-up was calculated using Kaplan–Meier methods and factors associated with loss to follow-up were identified by logistic and Cox multivariate regression analysis.
追踪损失发生率利用Kaplan - Meier方法加以计算，而追踪损失的相关因素则利用logistic回归分析和Cox多元回归分析加以确定。
Methods: to study factors of influence survival time with multivariate analysis.
方法采用多因素分析的方法研究影响生存时间的因素。
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