Fig. 2

The potential nonlinear relationship between TyG index level and the risk of delirium in elderly ICU patients by restricted cubic spline regression. The red and dashed lines represent the estimated OR and 95% CIs, respectively. (A) Model 1 was an unadjusted model; (B) Model 2 was adjusted for sex, age, laboratory parameters (albumin, serum potassium, serum sodium, creatinine, WBC, RBC, platelet); (C) Model 3 was adjusted for comorbidities (congestive heart failure, sepsis, chronic pulmonary disease, myocardial infarction, liver disease, cerebrovascular disease, diabetes, renal disease, hypertension, malignant cancer) on the basis of Model 2. The final fully adjusted restricted cubic spline regression showed that the cut value of TyG index was 8.912. Abbreviations: TyG, Triglyceride-glucose