safety factor for dropout 回动可靠系数 ; 返回安全系数
Background Trials comparing the effectiveness and safety of weight-loss diets are frequently limited by short follow-up times and high dropout rates.
背景——比较减肥饮食的安全性和有效性的临床试验，经常受到很短的随访时间和很高的中途退出率的局限。
In the paper, the FTA of system safety engineering is used to analyze the accident of person dropout in moving raise cage.
文中应用安全系统工程中的事故树分析方法对天井吊罐运行中人员坠落事故进行了分析。
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