Table 4. Multiple Regression Analysis for Delirium Days (n = 20,642).

Variables	Partial Regression Coefficient (B)	Standardized Coefficient (β)	95% Confidence Intervals		p-value
			Lower	Upper
Age (continuous variable)	0.077	0.147	0.070	0.084	<0.0001
Men	−0.261	−0.042	−0.346	−0.175	<0.0001
Charlson Comorbidity Index
0 (reference)
1–2	0.321	0.026	0.086	0.557	0.0075
≥3	0.053	0.004	0.188	0.294	0.6649
Number of Drugs Used
1–2 (reference)
3–4	2.225	0.098	1.937	2.567	<0.0001
Days from Surgery to First Day of Delirium
0–1 (reference)
2–3	−0.670	−0.051	−0.852	−0.488	<0.0001
4–6	−0.650	−0.036	−0.898	−0.401	<0.0001
Consultation-Liaison Psychiatry
None (reference)
Early (0–2 days)	0.558	0.024	0.235	0.881	0.0007
Late (3–5 days)	3.169	0.064	2.507	3.831	<0.0001