Repetitive tympanometric screenings were performed in 79 randomized, otherwise healthy @entity1 from 2 to 7 years old. A total of nine screenings, of which three included otomicroscopy, were performed. When the @entity1 were 7 years of age, radiographs were made of their mastoid processes in Runstr  m's lateral projection. The median size of the cell system was 8.25 cm2. The cell systems were significantly larger (9 cm2) in @entity1 than in @entity1 (7.5 cm2). A significant correlation was found between the size of the cell system and the duration of @entity2171 ; thus, the smallest air cell systems occurred in the @entity1 with the longest episodes of @entity2171 , and the largest cell systems in @entity1 with no history of @entity2171 . Eardrum changes occurred at the ages of 5, 6, and 7 years in 21%, 32%, and 25% of the @entity1 , respectively. @entity1 in whom the same eardrum changes were present at all three examinations had significantly smaller cell systems than those with either no changes or changes only at a few of the examinations. No differences in extent of pneumatization were found, regardless of whether the @entity1 had had episodes of acute @entity2346 , had been treated for @entity2171 , or had had neither. In our opinion, this study supports the theory that hypocellularity is a sequela of @entity2171 rather than a cause of the disease.

Size of the mastoid air cells and XXXX media.

@entity1 :: ('9606', 'Species') :: ['children', 'Children', 'girls', 'boys'] @entity2171 :: ('MESH:D010034', 'Disease') :: ['secretory otitis', 'secretory otitis media'] @entity2346 :: ('MESH:D010031', 'Disease') :: ['otitis']
@entity2346 :: (MESH:D010031,Disease) :: ['otitis']
