Fig 2.

Peak DRS-R-98 to POD1 change in plasma amyloid univariate (a, c, e) correlation plots and (b, d, f) delirium boxplots. Based on Cook's distances for peak DRS-R-98 ∼ amyloid univariate regression, six, seven, and three outliers were excluded for Aβ40, Aβ42, and AβR, respectively. Spearman methods were used for univariate correlation. Red triangles indicate participants diagnosed with postoperative delirium, and blue circles represent those without delirium. Black lines represent linear regression smoothing for all participants. Aβ, amyloid beta; AβR, amyloid beta ratio; DRS, Delirium Rating Scale-Revised-98; POD, postoperative day.