Developing a nomogram for postoperative delirium in elderly patients with hip fractures

Table 4 Receiver operating characteristic curve parameters of 7 characteristic factors

Marker	AUC	95%CI	Specificity	Sensitivity	Youden index	Cut off
Age	0.705	0.629-0.781	65.20%	66.04%	31.24%	79.5
History of cognitive impairment	0.525	0.488-0.562	97.49%	7.55%	5.04%	0.5
Preoperative RBC count	0.63	0.544-0.717	57.68%	67.92%	25.60%	3.725
Preoperative albumin	0.7	0.621-0.779	75.24%	54.72%	29.95%	33.5
Preoperative hemoglobin	0.645	0.574-0.717	36.36%	88.68%	25.04%	121.5
Preoperative PLT	0.605	0.518-0.693	83.07%	39.62%	22.69%	145.5
Intraoperative blood loss	0.598	0.519-0.677	65.52%	49.06%	14.57%	250

AUC: Area under the curve; CI: Confidence interval; RBC: Red blood cell; PLT: Platelet count.