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Spearman relative analysis
| Variable | P value |
|---|---|
| Age | 0.179 |
| Sex | 0.589 |
| BMI | 0.634 |
| Hypertention | 0.034 |
| Diabetes | 0.003 |
| Fusion segment | 0.090 |
| Operation duration | 0.010 |
| Preoperative Hct | 0.996 |
| Postoperative Hct | 0.000 |
| Thickness of the psoas | 0.743 |
| Thickness of the dorsal extensor group | 0.144 |
| thickness of the subcutaneous fat | 0.296 |
