Abstract
Middle-ear disorders are the major cause of hearing loss in the young school child, the majority of sensorineural disorders already having been detected. Mild conductive deafness may lead to educational retardation, psychological and social problems as well as to more severe middle-ear problems. It is consequently important to detect persistent middle-ear conditions as early as possible. Pure-tone audiometry has been shown to be a poor method of identifying middle-ear effusions. Impedance measurement is considerably more efficient, and different approaches are reviewed in the light of long-term studies of middle-ear effusion.

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