title: The hearing threshold levels of children at school age.
abstract: OBJECTIVE
  To measure the hearing threshold levels by air conduction in a group of unselected and a group of selected (otologically normal) school-aged children.
  
  
  METHODS
  Six hundred eighty-seven unselected school children representing three age groups and 471 selected, otologically normal children were examined by pure-tone audiometry.
  
  
  RESULTS
  The obtained results showed that hearing levels improved with age from 7 to 10 yr in children in both groups. The pure-tone averages (PTAs) of the right and the left ear in otologically normal children were, respectively, 1.8 and 1.2 dB HL in 7-yr-old children, -0.9 and -1.7 dB HL in 10-yr-old children, and -1.3 and -2.0 dB HL in 14-yr-old children. The PTAs were 0.2 to 1.9 dB poorer in the groups of unselected children.
  
  
  CONCLUSIONS
  The present study provides new data on the hearing sensitivity among unselected 7-, 10-, and 14-yr-old school children. Furthermore, it provides normative values on the hearing thresholds of otologically normal children in these three age groups.
authors.affiliation: Department of Otolaryngology, Turku University Central Hospital, Finland.
authors.forename: J J
authors.initials: JJ
authors.lastname: Haapaniemi
mesh_terms: D000158:Acoustic Impedance Tests; D000293:Adolescent; D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold; D002648:Child; D005260:Female; D006309:Hearing / Q000502:physiology*; D006801:Humans; D008297:Male; D012022:Reflex, Acoustic