Conclusions: Children's middle-ear diseases, such as negative pressure, SOM, AOM, and atrophic scar on the ear drum, may结论：儿童的中耳疾病，如中耳负压、中耳积液、急性中耳炎、鼓膜萎缩性瘢痕，均可能造成变频耳声传射的消失。