Receiver operating characteristics curve was employed to define the cutoff points of left atrium size and albumin levels, respectively. 接受者工作特征(ROC)曲线分析确定白蛋白水平和左心房大小的临界值。
The cutoff values of P / C in first morning urine specimens for screening urinary protein excretion of 1g and 3g in 24-hour collections were determined by receiver operating characteristics ( ROC ) curve. 采用ROC曲线分析确定晨尿P/C相对于24h尿蛋白定量为1g及3g的诊断界点。