Table 1 Demographic characteristics in the training set
Characteristics | Delayed discharge (n = 137) | Non-delayed discharge (n = 734) | t/z/χ2 | P value |
|---|---|---|---|---|
Age n (%) | Â | Â | 5.657 | 0.059 |
 65–80 | 134(56.5) | 418(64.9) |  |  |
 81–90 | 89(37.6) | 201(31.2) |  |  |
 > 90 | 14(5.9) | 25(3.9) |  |  |
Preoperative waiting time n (%) |  |  | 117.207 |  < 0.001 |
 ≤ 48 h | 18(7.6) | 304(47.2) |  |  |
 > 48 h | 219(92.4) | 430(52.8) |  |  |
Gender n (%) | Â | Â | 0.895 | 0.344 |
 Female | 168 (70.9) | 435 (67.5) |  |  |
 Male | 69 (29.1) | 209 (32.5) |  |  |
Type of operation n (%) | Â | Â | 0.207 | 0.649 |
 Hip arthroplasty | 131(55.3) | 367(57.0) |  |  |
 internal fixation | 106(44.7) | 277(43.0) |  |  |
 Injury types n (%) |  |  | 1.561 | 0.212 |
 Low-energy injury | 225 (94.9) | 623 (96.7) |  |  |
 High-energy injury | 12 (5.1) | 21 (3.3) |  |  |
 Fracture types n (%) |  |  | 4.484 | 0.106 |
 Femoral neck fracture | 134 (56.5) | 395 (61.3) |  |  |
 Intertrochanteric fracture | 99 (41.8) | 246 (38.2) |  |  |
 Subtrochanteric fracture | 4 (1.7) | 3 (0.5) |  |  |
CCI n (%) |  |  | 82.579 |  < 0.001 |
 ≤ 3 | 170(71.7) | 606(94.1) |  |  |
 > 4 | 67(28.3) | 38(5.9) |  |  |
Multiple trauma n (%) |  |  | 7.596 |  < 0.001 |
 No | 197(83.1) | 579(89.9) |  |  |
 Yes | 40(16.9) | 65(10.1) |  |  |
Hypertension n (%) | Â | Â | 1.920 | 0.166 |
 No | 102(43.0) | 311(48.3) |  |  |
 Yes | 135(57.0) | 333(57.1) |  |  |
Coronary artery disease n (%) |  |  | 36.829 |  < 0.001 |
 No | 141(59.5) | 513(79.7) |  |  |
 Yes | 96(40.5) | 131(20.3) |  |  |
Diabetes n (%) | Â | Â | 2.419 | 0.120 |
 No | 158(66.7) | 464(72.0) |  |  |
 Yes | 79(33.3) | 180(28.0) |  |  |
Cerebral vascular disease n (%) |  |  | 14.561 |  < 0.001 |
 No | 200(84.4) | 598(92.9) |  |  |
 Yes | 37(15.6) | 46(7.1) |  |  |
Hemiplegia n (%) |  |  | 13.086 |  < 0.001 |
 No | 192(81.0) | 580(90.1) |  |  |
 Yes | 45(19.0) | 64(9.9) |  |  |
Miocardial infarction n (%) | Â | Â | 3.035 | 0.081 |
 No | 233(98.3) | 642(99.7) |  |  |
 Yes | 4(1.7) | 2(0.3) |  |  |
Heart failure n (%) | Â | Â | 11.079 | 0.001 |
 No | 223(94.1) | 633(98.3) |  |  |
 Yes | 14(5.9) | 11(1.7) |  |  |
Arrhythmia n (%) | Â | Â | 6.847 | 0.009 |
 No | 203(85.7) | 590(91.6) |  |  |
 Yes | 34(14.3) | 54(8.4) |  |  |
Chronic lung disease n (%) |  |  | 26.625 |  < 0.001 |
 No | 206(86.9) | 619(96.1) |  |  |
 Yes | 31(13.1) | 25(3.9) |  |  |
Connective tissue disease n (%) | Â | Â | 2.095 | 0.148 |
 No | 230(97.0) | 636(98.8) |  |  |
 Yes | 7(3.0) | 8(1.2) |  |  |
Renal insufficiency n (%) | Â | Â | 2.283 | 0.131 |
 No | 229(96.6) | 633(98.3) |  |  |
 Yes | 8(3.4) | 11(1.7) |  |  |
Liver insufficiency n (%) | Â | Â | 2.217 | 0.136 |
 No | 231(97.5) | 638(99.1) |  |  |
 Yes | 6(2.5) | 6(0.9) |  |  |
Anemia n (%) |  |  | 114.275 |  < 0.001 |
 No | 150(63.3) | 596(92.5) |  |  |
 Yes | 87(36.7) | 48(7.5) |  |  |
Hypoproteinemia n (%) |  |  | 115.305 |  < 0.001 |
 No | 127(53.6) | 562(87.3) |  |  |
 Yes | 110(46.4) | 82(12.7) |  |  |
Electrolyte disorder n (%) |  |  | 93.081 |  < 0.001 |
 No | 165(69.6) | 605(93.9) |  |  |
 Yes | 72(30.4) | 39(6.1) |  |  |
Malignant tumor n (%) | Â | Â | 6.520 | 0.011 |
 No | 12 (6.5) | 14 (19.5) |  |  |
 Yes | 108 (113.5) | 345 (339.5) |  |  |
Dementia n (%) | Â | Â | 2.283 | 0.131 |
 No | 229(96.6) | 633(98.3) |  |  |
 Yes | 8(3.4) | 11(1.7) |  |  |
Parkinson's disease n (%) | Â | Â | 0.078 | 0.781 |
 No | 234(98.7) | 639(99.2) |  |  |
 Yes | 3(1.3) | 5(0.8) |  |  |
Arteriosclerosis of lower limbs n (%) |  |  | 66.146 |  < 0.001 |
 No | 170(71.7) | 596(92.5) |  |  |
 Yes | 67(28.3) | 48(7.5) |  |  |
Secondary fracture n (%) | Â | Â | 7.190 | 0.007 |
 No | 231(97.5) | 642(99.7) |  |  |
 Yes | 6(2.5) | 2(0.3) |  |  |
Delirium n (%) |  |  | 12.917 |  < 0.001 |
 No | 222(93.7) | 633(98.3) |  |  |
 Yes | 15(6.3) | 11(1.7) |  |  |