Table 1 Descriptive analysis of the training set and validation set data
From: Prediction model for delirium in patients with cardiovascular surgery: development and validation
Variable | Total | Training set | Validation set | \(\chi ^{2}\)/t | P |
|---|---|---|---|---|---|
n (%)/\(\bar{x} \pm s\) | n (%)/\(\bar{x} \pm s\) | n (%)/\(\bar{x} \pm s\) | |||
Delirium | 405 (48.3) | 190 (48.8) | 215 (47.9) | 0.077 | 0.782 |
Gender | 0.061 | 0.804 | |||
Male | 496 (59.2) | 232 (59.6) | 264 (58.8) | ||
Female | 342 (40.8) | 157 (40.4) | 185 (41.2) | ||
Age | 60.0 ± 11.8 | 59.8 ± 11.2 | 60.2 ± 12.2 | 0.477 | 0.634 |
BMI | 23.9 ± 3.3 | 24.0 ± 3.4 | 23.9 ± 3.3 | −0.580 | 0.562 |
Blood type | 3.673 | 0.299 | |||
A | 269 (32.1) | 133 (34.2) | 136 (30.3) | ||
B | 236 (28.2) | 107 (27.5) | 129 (28.7) | ||
AB | 87 (10.4) | 33 (8.5) | 54 (12) | ||
O | 246 (29.4) | 116 (29.8) | 130 (29.0) | ||
Past history | |||||
Hypertension | 385 (45.9) | 175 (45.0) | 210 (46.8) | 0.267 | 0.605 |
Diabetes | 147 (17.5) | 63 (16.2) | 84 (18.7) | 0.910 | 0.340 |
Stroke | 48 (5.7) | 23 (5.9) | 25 (5.6) | 0.046 | 0.830 |
Atrial fibrillation | 190 (22.7) | 92 (23.7) | 98 (21.8) | 0.396 | 0.529 |
Malignant tumor | 35 (4.2) | 15 (3.9) | 20 (4.5) | 0.186 | 0.666 |
Type of surgery | 1.885 | 0.865 | |||
CABG | 193 (23) | 96 (24.7) | 97 (21.6) | ||
Valve replacement or shaping | 406 (48.4) | 185 (47.6) | 221 (49.2) | ||
Aortic valve replacement or shaping | 45 (5.4) | 18 (4.6) | 27 (6.0) | ||
Heart tumor removal | 22 (2.6) | 10 (2.6) | 12 (2.7) | ||
Congenital correction | 52 (6.2) | 23 (5.9) | 29 (6.5) | ||
Two kinds of surgery and above | 120 (14.3) | 57 (14.7) | 63 (14) | ||
CPB duration | 102.8 ± 75.6 | 98.8 ± 73.3 | 106.2 ± 77.4 | 1.414 | 0.158 |
Intraoperative minimum MAP | 40.4 ± 11.5 | 41.1 ± 11.2 | 39.8 ± 11.7 | −1.583 | 0.114 |
Intraoperative blood transfusion | 152 (18.1) | 72 (18.5) | 80 (17.8) | 0.067 | 0.796 |
Postoperative MV | 31.9 ± 57.3 | 33.3 ± 71.5 | 30.7 ± 41.4 | −0.644 | 0.520 |
Postoperative WBC | 13.3 ± 4.1 | 13.4 ± 4.3 | 13.3 ± 4.0 | −0.649 | 0.516 |
Postoperative Hct | 0.3 ± 0.04 | 0.31 ± 0.04 | 0.31 ± 0.04 | 0.946 | 0.345 |
Postoperative ALT | 45.8 ± 59.1 | 48.6 ± 68.9 | 43.4 ± 49.0 | −1.281 | 0.200 |
Postoperative TBIL | 25.3 ± 13.2 | 25.8 ± 14.4 | 24.7 ± 12.0 | −1.201 | 0.230 |
Postoperative serum albumin | 31.6 ± 5.6 | 31.6 ± 5.9 | 31.7 ± 5.3 | 0.109 | 0.913 |
Postoperative serum urea nitrogen | 9.5 ± 3.6 | 9.2 ± 3.5 | 9.7 ± 3.7 | 1.848 | 0.065 |
Postoperative Cr | 102.5 ± 40.9 | 101.8 ± 41.7 | 103.2 ± 40.2 | 0.490 | 0.624 |
Postoperative Serum Sodium | 146.1 ± 4.7 | 146.0 ± 4.3 | 146.1 ± 5.0 | 0.235 | 0.814 |