The following findings were recorded and compared between depressed and undepressed cases:the difference of occurrence of ossicular necrosis or fixation, or dysfunction of oval and/or round window.

• 记录阴、阳性例数,并比较术前阴、阳性组之间在术中所见的听骨链固定或坏死、前庭窗或蜗窗功能不良的发生率的差异。