如果在规定的结束时间,由于失访、死亡、未愈(未复发、痰菌未转阴)等没有出现结果事件者称之为截尾,从起点到截尾日的时间称为截尾数据。COX比例风险模型中:在实际失踪观察中,由于某种原因无法知道观察对象的确切生存时间,这种生存时间数据称为截尾数据。分类:可分为随机截尾数据和定时截尾数据。可在追踪随访期内任何时点上发生截尾的生存时间数据称为随机截尾数据。在预先确定了观察 If at the end of the prescribed period, the person who did not show any result of loss of follow-up, death, unhealed (non-recurrent, sputum negative) was called censoring, the time from the start to censoring is called censoring data . COX proportional hazards model: in the actual disappearance of observation, for some reason can not know the exact survival of the observed object, the survival time data is called censored data. Category: can be divided into random censored data and time-censored data. Census-dependent survival data at any point during the follow-up period are called randomized censored data. Observed in advance