Fig. 4

Positive stable network between depression, anxiety, and sleep quality. Comparison of networks at (a) baseline and (b) 18 months postoperatively. The blue edges indicate an increased correlation, and the red edges indicate a decreased correlation. (c) No edges between the nodes indicates no increased or decreased correlation between network at baseline and 18 months postoperatively. BAI, Beck Anxiety Inventory; BDI, Beck Depression Inventory; PSQI, Pittsburgh Sleep Quality Index.