Fig. 3.

Neopterin levels in CSF (a) and serum (b) by delirium status. p = 0.03 for CSF and p = 0.001 for serum (Kruskal-Wallis tests). No delirium (n = 50): patients that never had delirium or SSD (subsyndromal delirium). SSD (n = 21): patients that had some features of delirium but never fulfilled the criteria for full delirium. Incident delirium (n = 28): patients that were free from delirium when sample was taken but developed delirium later. Prevalent delirium (n = 35): those who had delirium when the samples were taken. The horizontal lines represent the median. Pre-operative delirium status missing in three patients. Three patients (one with ‘no delirium’ and two with ‘prevalent delirium’) had CSF neopterin above the upper margin of this figure