Table 2.
Outcome of two procedures treating chronic subdural hematoma
| BHDI group | BHD group | Test value | P | Power | |
|---|---|---|---|---|---|
| Pneumocrania *(ml) | 9.05 ± 3.50 | 4.85 ± 2.35 | t = 8.266 | 0.001 | 1.000 |
| Residual hematoma*(ml) | 10.76 ± 3.19 | 11.68 ± 4.10 | t = 1.541 | 0.126 | 0.326 |
| Rebleeding (%) | 11(12.5) | 2(3.2) | χ2 = 2.959 | 0.085 | 0.498 |
| Recurrence (%) | 6(6.8) | 5(7.9) | χ2 = 0.068 | 0.794 | 0.041 |
| Epilepsy (%) | 3(3.4) | 2(3.2) | χ2 = 0.006 | 0.937 | 0.021 |
| Infection (%) | 1(1.1) | 1(1.6) | χ2 = 0.057 | 0.812 | 0.007 |
BHDI burr hole drainage with irrigation, BHD burr hole drainage; Pneumocrania *, Pneumocrania in 1st postoperative day; Residual hematoma*, hematoma volumes of the 8th postoperative day