The postoperative hearing level had an improvement better than 15dB in 31 cases (37.8%), remained unchanged in 47 cases (56.6%), and became worse in 4 cases (4.9%).

• 术后听力提高31例,占37郾8%25,其中达到正常听力范围、气骨导差消失者19例,提高15dB以上但未达到正常者12例。 保持术前原有听力者47例,占56郾6%25。