Figure 2.

Box plots showing the median and interquartile ranges of pure tone thresholds before and at least 6 weeks after surgery for patients with near dehiscence and frank dehiscence. Outlier cases that developed a new sensorineural hearing loss after surgery were identified in figure 1 and are shown here as solid and hashed lines. One case in the frank dehiscence group had pre-operative sensorineural hearing loss that was stable after surgery.