[Influence of secretory otitis media on mastoid pneumatization. Multiple regression analysis]

The influence of secretory otitis media (SOM) on mastoid pneumatization was studied in 122 ears of 61 children under 15 who were seen at our clinic two times. Age, tympanometry, mastoid size, and time between visits were analyzed. Multiple regression analysis yielded and equation relating age and SOM with mastoid size at first examination. Another regression equation explained the contribution of SOM resolution or persistence and age on mastoid size at the time of the second examination. This equation explained 76.14% of the variability in mastoid size and showed that normal ears had better mastoid growth than children with SOM. Even thought inflammation resolved with medical or surgical treatment, mastoid pneumatization was more developed in normal subjects.