GFAP and delirium: No differences in GFAP levels were found in delirium at any stage (prevalent delirium median 0.81 ng/ml (IQR 0.33–1.31) vs. incident delirium 0.61 ng/ml (0.46–0.76) vs. never delirium 0.45 ng/ml (0.31–0.86), Kruskal–Wallis p = 0.58) (Table 2).