Observational Study
Copyright ©The Author(s) 2020.
World J Orthop. Feb 18, 2020; 11(2): 90-106
Published online Feb 18, 2020. doi: 10.5312/wjo.v11.i2.90
Table 2 Patient demographics and study population
POD (Mean +/- SD or n, %), n = 959Non-POD (Mean +/- SD or n, %), n = 77533P value
Age, yr72.7+/-12.962.3+/-14.1< 0.001a
≥ 70610 (63.6)24038 (31.0)< 0.001a
Male389 (40.6)34777 (44.9)0.008a
BMI28.2+/-6.228.0+/-6.10.003a
Procedure type< 0.001a
THA161 (16.8)19753 (25.5)
TKA249 (26.0)20106 (25.9)
Bilateral THA3 (0.3)853 (1.1)
Bilateral TKA29 (3.0)2337 (3.0)
Spine fusions140 (14.6)4135 (5.3)
Other spine procedures126 (13.1)6587 (8.5)
Other procedures251 (26.2)23762 (30.7)
Trauma< 0.001a
Fracture of femur/pelvis57 (5.9)731 (0.9)
Other trauma30 (3.1)2607 (3.4)
No trauma872 (90.9)74195 (95.7)
Length of stay6.0+/-7.53.0+/-3.2< 0.001a
Latest creatinine before surgery< 0.001a
< 1.2 mg/dL825 (86.0)71048 (91.6)
1.2-2.0 mg/dL123 (12.8)6229 (8.0)
> 2.0 mg/d11 (1.2)256 (0.3)
Preoperative hyponatremia< 0.001a
Yes367 (38.3)21290 (27.5)
No591 (61.6)56190 (72.5)
Missing1 (0.1)53 (0.07)
Postoperative thiamine order< 0.001a
Yes119 (12.4)1390 (1.8)
No839 (87.5)76122 (98.2)
Missing1 (0.1)21 (0.03)
Atrial fibrillation (present on admission)130 (13.6)3815 (4.9)< 0.001a
Pressure ulcers (present on admission)23 (2.4)323 (0.42)< 0.001a
Opioid dependence or long-term use29 (6.2)1245 (1.6)< 0.001a
Psychiatric disease (present on admission)356 (37.1)16716 (21.6)< 0.001a
Anesthesia type< 0.001a
General344 (35.9)16356 (21.9)
Other578 (60.3)56067 (72.3)
Missing37 (3.9)4510 (5.8)
Patient-controlled analgesia< 0.001a
Epidural413 (43.1)40991 (52.9)
IV441 (46.0)22458 (29.0)
Peripheral nerve infusion11 (1.2)949 (1.2)
Missing94 (9.8)13135 (16.9)
Received diazepam< 0.001a
Yes98 (10.2)3135 (4.0)
No860 (89.7)74377 (95.9)
Missing1 (0.1)21 (0.03)
CT, MRI or both performed< 0.001a
Yes872 (90.9)64838 (83.6)
No86 (9.0)12674 (16.4)
Missing1 (0.1)21 (0.03)
ASA score< 0.001a
17 (0.73)4933 (6.4)
2477 (49.7)53801 (69.4)
≥ 3438 (45.7)14274 (18.4)
Missing37 (3.9)4525 (5.8)