Systemic immune-inflammation index predicts postoperative delirium in elderly patients after surgery: a retrospective cohort study

Table 2 Association between SII and POD with logistic regression models and PSM analysis

Model	OR^a	95%CI	P
Unadjusted model	2.709	2.373–3.092	< 0.001
Model 1 (adjusted for preoperative variables)^b	1.615	1.384–1.882	< 0.001
Model 2 (adjusted for intraoperative variables)^c	1.855	1.602–2.146	< 0.001
Model 3 (adjusted all the variables)^d	1.302	1.106–1.531	0.001
Model PSM (n = 10,062)^e	1.301	1.062–1.598	0.011

SII Systemic-immune-inflammation index, POD Postoperative delirium, OR Odds ratio, CI Confidence interval, PSM Propensity score matching
^aThe ORs of SII > 650
^bModel 1 adjusted for age, sex, BMI, ASA, alcohol, cerebrovascular disease, COPD, depression and anxiety, antipsychotic drugs, benzodiazepines, hemoglobin, WBC count, albumin, AST, ALT, PT, types of surgery, and anesthesia methods
^cModel 2 adjusted for emergency surgery, duration of anesthesia, colloid, blood transfusion, duration of SBP > 140 mmHg, and MAP < 60 mmHg
^dModel 3 adjusted for model 1 plus model 2
^eModel PSM was a univariate regression model

ISSN: 1471-2318