Statistical Analysis
Statistical analysis was performed using software (SPSS 13.0 for Windows, SPSS Inc, Chicago, IL). Differences between decompressive craniectomy with or without
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hematoma evacuation groups were compared by using the Student t test for continuous variables and the Chi- square test for categorical data. Variables were selected for multiple logistic regression analysis to evaluate the in- dependent effect of the intervention method on outcomes, adjusting for baseline differences in patient characteristics. P less than .05 was accepted as statistically significant.