• For six months we observed all 3-year-old children showing type B or C tympanograms at a prevalence study in a geographically limited area (372 ears or 37.2% of the screened total) to study the spontaneous course of middle ear effusions. A considerable test-retest stability was found only for type B. In type C, such stability was equally rare whether the middle ear pressure was highly or only slightly negative. Conversion to type A was observed in about 70% of cases. Ears having a middle ear pressure from −100 to −199 mm H2O almost always returned to normal. The tendency for a negative middle ear pressure or middle ear effusion to develop was the same for both sexes. Conversely, the prognosis of an effusion, once formed, differed significantly, with only girls showing a brief course. Accordingly, a sex-differentiated evaluation appears to be needed in preschool tympanometric screening, and should be included in all clinical considerations when middle ear effusion is demonstrated in young children.
(Arch Otolaryngol 105:461-466, 1979)
Fiellau-Nikolajsen M, Lous J. Prospective Tympanometry in 3-Year-Old Children: A Study of the Spontaneous Course of Tympanometry Types in a Nonselected Population. Arch Otolaryngol. 1979;105(8):461–466. doi:10.1001/archotol.1979.00790200023005
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