Table 2.
The characteristics of all enrolled patients(Training set vs. Testing set)
| Variables | Total patients (n = 327) |
Training set (n = 228) |
Testing set (n = 99) |
t / χ2 / Z | P-value |
|---|---|---|---|---|---|
| Demographics | |||||
| Age, years | 51.63 ± 14.38 | 52.32 ± 13.74 | 50.03 ± 15.71 | -1.2564 | 0.2107 |
| Perioperatives | |||||
| Indwelling urinary catheters | 0.9726 | 0.324 | |||
| yes | 227 | 154 | 73 | ||
| no | 100 | 74 | 26 | ||
| Arteriovenous catheterization | 0.84331 | 0.3585 | |||
| yes | 80 | 52 | 28 | ||
| no | 247 | 176 | 71 | ||
| Secondary surgery in a short period | 0.016849 | 0.8967 | |||
| yes | 19 | 14 | 5 | ||
| no | 308 | 214 | 94 | ||
| Duration of surgery, minutes | 124 (170-80) | 124 (166.25-81.5) | 113 (170-79) | 2.1046 | 0.673 |
| Blood loss during surgery, ml | 150 (400-100) | 150 (400-80) | 200 (400-100) | 1.3283 | 0.572 |
| Time from withdrawal of medicine to awake, minutes | 15.77 ± 3.76 | 15.82 ± 3.67 | 15.66 ± 3.97 | -0.34078 | 0.7337 |
| Immobilization | 0.60667 | 0.436 | |||
| yes | 104 | 69 | 35 | ||
| no | 223 | 159 | 64 | ||
| Tourniquet during surgery | 4.2322 | 0.03966 | |||
| yes | 65 | 38 | 27 | ||
| no | 262 | 190 | 72 | ||
| Moderate to severe postoperative pain | 0.11243 | 0.7374 | |||
| yes | 135 | 96 | 39 | ||
| no | 192 | 132 | 60 | ||