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。
Multivariate analysis was done by COX proportional hazard model.
多因素分析：COX比例风险模型。
Multivariate analysis was done by COX proportional hazard model.
多因素分析：COX比例风险模型。
应用推荐