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.