title: Tympanometry in three-year-old children. II. Seasonal influence on tympanometric results in non-selected groups of three-year-old children.
abstract: Screening tympanometry was performed in January 1976 and in August 1978 on 938 healthy 3-year-old children (1 868 ears), constituting more than 95% of the total population of 3-year-olds living in a Danish provincial municipality at the time of testing. Seasonal influence upon the occurrence of middle ear effusion and tubal dysfunction, not previously quantitated by systematic studies on pre-school children, was thus elucidated by comparing the prevalence of these conditions in winter and in summer. There was a statistically significant preponderance of pathological tympanometry in winter, but the difference was not overwhelming. The findings emphasize that problems relating to a disturbed middle ear function in early childhood are of great practical importance throughout the year.
mesh_terms: D000158:Acoustic Impedance Tests; D002675:Child, Preschool; D003718:Denmark; D004427:Ear Diseases / Q000453:epidemiology; D005064:Eustachian Tube; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening; D010033:Otitis Media / Q000453:epidemiology*; D012621:Seasons; D012737:Sex Factors