The pre-operative pain scores, intra-operative staging Results, surgical duration, intra-surgical blood loss, post-operative pain relief were compared between these two groups.

比较两组患者的术前疼痛评分、术中分期、手术时间、术中出血量、术后疼痛缓解效果及术后并发症等。

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We compared the differences of the risk factors between these two groups, and analyzed them by simple correlation and multiple stepwise regressions.

比较两组间相关危险因素的差别，并对这些危险因素进行单因素相关分析和多元逐步线性回归分析。

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