High-Frequency Threshold (10 - 20 KHz) in Top Grade Ranking Primary School Children

• Main Authors: Dr. Gholamreza Babaei, Dr. Abdollah Mousavi, Nematollah Rouhbakhsh, Mehrnaz Karimi
• Format: Article
• Language: fas
• Published: Tehran University of Medical Sciences 2001-05-01
• Series: Audiology
• Subjects: Pure Tone Audiometry (PTA); Tympanometry; Hearing Thresholds; High Frequency Hearing Thresholds
• Online Access: http://journals.tums.ac.ir/PdfMed.aspx?pdf_med=/upload_files/pdf/13709.pdf&manuscript_id=13709

Method and Materials: This cross - sectional survey is carried out in pediatric clinic; department of audiology; faculty of rehabilitation, TMSU, on spring 1998. 102 top grade ranking children with normal hearing threshold (<I5dBHL from 0.25 to 8KHz) (6 ears omitted during the project) and normal tympanometry, ranging from 7-13 years old, including 51 boys and 51 girls were examined with a Beltone 2000 audiometer with sennheiser HD 250 earphones calibrated by a bruel and kjaer 6cc coupler. Results: I- The thresholds were not significantly different at any frequency (P>0.05) in test re-test trials. "n2- The test minus re-test threshold for individual ears showed clinically reliable and acceptable range 0-10dB SPL for at least "n99.74% of the ears at all frequencies. 3- The threshold differences between right & left cars in two test sessions were not significantly different (P>0.05) except for 14KHz. 4- High- frequency threshold in two test sessions showed no significant difference between girls & boys at all frequencies (P>0.05) (except for 16 & 20 KHz in right ear and 10 KHz in left ear). Conclusion: This test can be used for evaluation of individual high-frequency threshold in all frequency as test re-tests tria1. Moreover, this test may use as a beneficial tool for monitoring different endogenous and exogenous auditory pathologies. Consideration: it is found that this research is valid only among situation of this project. Any generalization needs further research.