Table 3.

Postoperative POD prevalence and daily incidence

Delirium incidence	PS (N = 23)	MS (N = 27)	MK (N = 24)	PK (N = 30)	p-value
Surgery night	4 (17.39%)	3 (11.11%)	3 (12.5%)	4 (13.33%)	0.941
1 st day	1 (4.35%)	3 (11.11%)	2 (8.33%)	0 (0.0%)	0.261
1 st night	1 (4.35%)	2 (7.41%)	1 (4.17%)	0 (0.0%)	0.530
2nd day	2 (8.7%)	1 (3.7%)	1 (4.17%)	0 (0.0%)	0.369
2nd night	1 (4.35%)	1 (3.7%)	0 (0.0%)	0 (0.0%)	0.465
3rd day	1 (4.35%)	1 (3.7%)	0 (0.0%)	1 (3.33%)	0.893
3rd night	1 (4.35%)	2 (7.41%)	0 (0.0%)	1 (3.33%)	0.730
4th day	1 (4.35%)	0 (0.0%)	0 (0.0%)	1 (3.33%)	0.718
4th night	1 (4.35%)	0 (0.0%)	0 (0.0%)	1 (3.33%)	0.718
Prevalence (95% exact confidence interval)	4 (17.39%) (4.95–38.78%)	6 (22.23%) (8.62–42.26%)	4 (16.67%) (4.74–37.38%)	5 (16.67%) (5.64–34.72%)	0.957

PS, placebo-saline; MS, melatonin-saline; MK, melatonin-ketamine; PK, placebo-saline