Table 5.

Multivariable analysis with odds ratio (OR) and 95% confidence interval (CI) for total effect of postoperative delirium on reoperation, readmission, and Clavien–Dindo IV° complications after total joint arthroplasty

Variable	OR (CI)	p-value
Reoperation
Postoperative delirium	2.0 (1.1–3.4)	0.02
Surgery site (knee)	0.9 (0.8–1.1)	0.3
Age per 5 years	1.1 (1.0–1.1)	0.04
ASA classification	1.6 (1.4–1.9)	0.001
Operative time per 15 minutes	1.3 (1.2–1.3)	0.001
Sex (male)	0.9 (0.7–1.1)	0.1
Readmission
Postoperative delirium	2.4 (1.5–4.0)	0.001
Surgery site (knee)	1.1 (0.9–1.4)	0.2
Age per 5 years	1.1 (1.0–1.2)	0.001
ASA classification	1.6 (1.4–1.9)	0.001
Operative time per 15 minutes	1.2 (1.2–1.3)	0.001
Sex (male)	0.9 (0.8–1.1)	0.6
Clavien–Dindo IV
Postoperative delirium	2.7 (1.5–5.0)	0.001
Surgery site (knee)	0.9 (0.6–1.2)	0.4
Age per 5 years	1.4 (1.3–1.5)	0.001
ASA classification	1.8 (1.4–2.3)	0.001
Operative time per 15 minutes	1.1 (1.0–1.2)	0.01
Sex (male)	0.8 (0.6–1.2)	0.3

ASA = American Society of Anesthesiologists.

For assumed cause–effect relation please see Figure 2.