Association of preoperative depression and cognitive status with postoperative delirium in elderly patients with hip fracture

Table 3 Univariate logistic regression analysis for risk factors of postoperative delirium

Variable	Odds ratio	95%CI	P value
Age ≥ 80 years	2.68	1.32-5.44	0.006
Female sex	0.84	0.40-1.76	0.635
Body mass index < 18.5 kg/m2	1.86	0.74-4.67	0.189
Education < 6 years	1.34	0.66-2.72	0.414
Living alone	1.32	0.59-2.95	0.509
American Society of Anesthesiologists classification ≥ III	2.77	1.38-5.58	0.004
Preoperative depression (15-item Geriatric Depression Scale ≥ 5)	2.64	1.28-5.44	0.008
Preoperative cognitive impairment (Mini-Mental State Examination < 24)	4.67	2.25-9.70	< 0.001
Activities of Daily Living score (per 10-point decrease)	1.28	1.04-1.58	0.021
Number of comorbidities ≥ 3	1.65	0.82-3.31	0.164
Hypertension	1.31	0.62-2.75	0.477
Diabetes mellitus	1.37	0.65-2.90	0.410
Coronary artery disease	1.47	0.66-3.26	0.350
Hemoglobin < 100 g/L	2.18	1.06-4.49	0.035
Albumin < 35 g/L	2.92	1.44-5.93	0.003
Intertrochanteric fracture (vs femoral neck)	1.23	0.60-2.54	0.574
Time to surgery > 3 days	1.54	0.77-3.08	0.222
General anesthesia (vs regional)	1.17	0.58-2.37	0.659
Surgical duration > 120 minutes	2.34	1.16-4.71	0.017
Intraoperative blood transfusion	2.09	1.01-4.31	0.046