3.1. Comparison of the mastoid pneumatization in the healthy and the diseased ears
There were no significant differences in pneumatizion of the petrous apex, perilabyrinthine, and mastoid cells between the healthy and diseased-side for group 1. However, statistically, significant differences were seen in the aeration of the three regions between the healthy and diseased-side for group 2. Proportions and p-values are given in Tables 1 and 2 . Post-hoc analysis was done to compare the pneumatization degree of mastoid cells for group 2, using multiple z-tests of two proportions with a Bonferroni correction. Statistical significance was accepted at p< 0.016667. Although there were statistically significant differences in proportions of fully pneumatized (p=0.012) and sclerotic (p<0.001) mastoid cells, no difference was seen in proportions of diploic (p=0.211) mastoid cells between healthy and diseased-side.