设计：非随机化同期对照的回顾性分析，盲法评估。
DESIGN: Non - randomized and concurrently controlled retrospective analysis wi th blind evaluation.
在患者入院、每月及出院时，由受盲法控制的评估人员收集患者的OCD、抑郁及心理社会功能的测评资料。
Blinded raters collected measures of OCD, depression, and psychosocial functioning at admission, each month, and at discharge.
方法：三位有经验的脊柱外科医师分别对相同患者的CT扫描和MRI进行评估，按盲法，随机的原则在一个月内获取每个病人资料。
Methods. Three experienced spine surgeons retrospectively evaluated CT scans and MRIs of the same patients, obtained within 30 days of each other in a blinded, random fashion.
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