METHODS: After obtaining ethical approval and written informed consent,25 postoperative patients were asked to quantify their level of pain on a numeric rating scale( NRS,0-10) at different time points in the recovery room.

• 方法：在获得伦理批准及知情同意后，恢复室中25名术后患者被要求在数值评分量表（RS,0-10)量化他们各时间点的疼痛程度。