Table 1 Comparison of baseline characteristics and other covariables between patients with and without postoperative delirium
|  | Non-POD (n = 302) | POD (n = 67) | p-value | Standardized difference |
|---|---|---|---|---|
Sex, male | 221 (73.2%) | 44 (65.7%) | 0.217 | 0.158 |
Age, yr | 78.54 ± 6.78 | 79.85 ± 7.32 | 0.16 | 0.179 |
Weight, kg | 61.27 ± 11.09 | 61.69 ± 10.92 | 0.782 | 0.038 |
BMI, kg/m2 | 23.45 ± 3.62 | 23.79 ± 3.61 | 0.485 | 0.095 |
ASA physical status class | Â | Â | 0.595 | 0.096 |
 I | 5 (1.66%) | 0 (0%) |  |  |
 II | 194 (64.24%) | 41 (61.19%) |  |  |
 III | 103 (34.11%) | 26 (38.81%) |  |  |
ACCI | 3 (2,4) | 4 (2.2,4) | 0.116 | 0.230 |
Hypertension | 179 (59.3%) | 49 (73.1%) | 0.035 | 0.313 |
Diabetes | 85 (28.1%) | 25 (37.3%) | 0.138 | 0.190 |
Ischemic heart disease | 71 (23.5%) | 18 (26.9%) | 0.561 | 0.076 |
Stroke | 65 (21.5%) | 11 (16.4%) | 0.35 | 0.138 |
Chronic obstructive pulmonary disease | 33 (11.0%) | 7 (10.4%) | 0.902 | 0.017 |
Smoking status, yes | 59 (19.5%) | 16 (23.9%) | 0.424 | 0.102 |
Alcohol abuse, yes | 27 (8.9%) | 10 (14.9%) | 0.140 | 0.168 |
ADL, points | 14 (14,15) | 14 (14,16) | 0.122 | 0.236 |
Education, yr | 9 (4,12) | 9 (6,12) | 0.683 | 0.054 |
MMSE, points | 26 (22,28) | 24 (18,27.5) | 0.009 | 0.327 |
Anesthesia method | Â | Â | 0.004 | 0.390 |
 Spinal anesthesia | 189 (62.6%) | 29 (43.3%) |  |  |
 General anesthesia | 113 (37.4%) | 38 (56.7%) |  |  |
Duration of anesthesia, min | 90 (70,110) | 90 (75,100) | 0.886 | 0.109 |
Duration of surgery, min | 60 (40,80) | 60 (30,75) | 0.387 | 0.243 |
Time from injury to surgery, hours | 96 (70,124.6) | 81.8 (63.8,144.9) | 0.492 | 0.143 |
Type of fracture | Â | Â | 0.641 | 0.008 |
 Intertrochanteric | 152 (50.3%) | 34 (50.7%) |  |  |
 Femoral neck | 148 (49%) | 32 (47.8%) |  |  |
 Subtrochanteric | 2 (0.7%) | 1 (1.5%) |  |  |
Hospital stay, days | 4 (3,5) | 5 (3,5) | 0.621 | 0.093 |