Details

Autor(en) / Beteiligte

• de Beer, Brechtje
• Graamans, Kees
• Zielhuis, Gerhard
• Snik, Ad

Titel

HEARING THRESHOLDS OF OTOLOGICALLY HEALTHY 18-YEAR-OLDS

Ist Teil von

• Journal of hearing science, 2011, Vol.1 (2), p.27-34

Erscheinungsjahr

2011

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Objective To determine mean hearing thresholds for 18-year-old, otologically healthy subjects Study design Prospective historical cohort study Methods As part of a follow-up study of a birth cohort, followed from age 2 to 18 years, meticulous otological examination including history-taking, otoscopy, and audiometry were available. At age 18, both air-conduction thresholds (0.25 kHz to 8 kHz and 8 kHz to 16 kHz) and bone-conduction thresholds (0.5 kHz to 4 kHz) were measured. Subjects of this cohort were defined as otologically healthy if they had not experienced substantial otitis media in childhood. Results On both ends of the frequency range of air-conduction testing, measured thresholds deviated statistically significantly from the ISO 389 reference zero. The air-conduction thresholds were comparable to data presented in the literature. Furthermore, a misfit with the ISO 389 reference was found at 2 and 3 kHz for bone-conduction testing. Only the mean boneconduction thresholds at 0.5 kHz and 4 kHz were not significantly different from the ISO 389 reference zero. To explain the deviations at high frequencies, noise exposure was considered but thought unlikely Conclusions This study cohort seems to be the best representative sample so far of otologically healthy subjects due to the longitudinal study of their otological status. Mean hearing thresholds at age 18 are different from the ISO 389 reference zero, suggesting once more the need to revise this ISO norm.