Method: The bone conductive hearing threshold was tested in 168 CSOM ears of 135 cases and 66 healthy ears of 66 patients with unilateral otitis as controls.

• 方法：测量135例（168耳）CSOM患者的骨导听阈，并以66例单侧患者的健耳为对照，比较不同类型、不同病程的CSOM的骨导听阈。