Re-evaluation of initial masking level in pure tone audiometry

There are several methods of masking which can be applied in pure tone audiometry, and currently different audiological settings apply different initial masking levels. A high level of initial masking could lead to potential overmasking and reaching audiometric limits before a plateau can be establi...

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Bibliographic Details
Main Authors:	Rahmat, Sarah, Jamaluddin, Saiful Adli, Dzulkarnain, Ahmad Aidil Arafat
Format:	Conference or Workshop Item
Language:	English
Published:	2011
Subjects:	R Medicine (General)
Online Access:	http://irep.iium.edu.my/26743/ http://irep.iium.edu.my/26743/3/IRIIE_2.pdf

id	iium-26743
recordtype	eprints
spelling	iium-267432016-05-06T01:13:22Z http://irep.iium.edu.my/26743/ Re-evaluation of initial masking level in pure tone audiometry Rahmat, Sarah Jamaluddin, Saiful Adli Dzulkarnain, Ahmad Aidil Arafat R Medicine (General) There are several methods of masking which can be applied in pure tone audiometry, and currently different audiological settings apply different initial masking levels. A high level of initial masking could lead to potential overmasking and reaching audiometric limits before a plateau can be established. The purpose of this study is to establish the optimum initial masking level that can be used in “Plateau Method” of masking. The Minimum Effective Masking Level (MEML) of 30 normal hearing ears was determined at octave frequencies from 250Hz to 4000Hz. Mean MEML for the octave frequencies ranged from -1.8 to 0.7 dB SL. There were significant differences of MEML between 250 Hz and 2 KHz, and 250 Hz and 4 KHz (P <0.05) with higher MEML recorded at higher frequencies as compared to 250Hz. MANOVA revealed no significant difference of MEML between male and female across frequencies (P<0.05). Pearson correlation revealed a strong positive significant linear relationship between pure tone level and masker level for all frequencies (P<0.05; 0.95<r<1.0) which suggests that the narrowband noise used is effectively masking the pure tone signals. The highest recorded MEML is 5dB SL at all octave frequencies. Taking a conservative approach, this value was used in the calculation of optimum initial masking level in addition to 5 dB to ensure significant threshold shift. It is recommended that 10 dB SL of initial masking level is applied in audiology clinics in Malaysia as it is adequate to effectively mask the pure tone threshold. 2011 Conference or Workshop Item NonPeerReviewed application/pdf en http://irep.iium.edu.my/26743/3/IRIIE_2.pdf Rahmat, Sarah and Jamaluddin, Saiful Adli and Dzulkarnain, Ahmad Aidil Arafat (2011) Re-evaluation of initial masking level in pure tone audiometry. In: IIUM Research Invention and Innovation Exhibition IRIIE 2011, 9-10, February 2011, Gombak, Kuala Lumpur. (Unpublished)
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	R Medicine (General)
spellingShingle	R Medicine (General) Rahmat, Sarah Jamaluddin, Saiful Adli Dzulkarnain, Ahmad Aidil Arafat Re-evaluation of initial masking level in pure tone audiometry
description	There are several methods of masking which can be applied in pure tone audiometry, and currently different audiological settings apply different initial masking levels. A high level of initial masking could lead to potential overmasking and reaching audiometric limits before a plateau can be established. The purpose of this study is to establish the optimum initial masking level that can be used in “Plateau Method” of masking. The Minimum Effective Masking Level (MEML) of 30 normal hearing ears was determined at octave frequencies from 250Hz to 4000Hz. Mean MEML for the octave frequencies ranged from -1.8 to 0.7 dB SL. There were significant differences of MEML between 250 Hz and 2 KHz, and 250 Hz and 4 KHz (P <0.05) with higher MEML recorded at higher frequencies as compared to 250Hz. MANOVA revealed no significant difference of MEML between male and female across frequencies (P<0.05). Pearson correlation revealed a strong positive significant linear relationship between pure tone level and masker level for all frequencies (P<0.05; 0.95<r<1.0) which suggests that the narrowband noise used is effectively masking the pure tone signals. The highest recorded MEML is 5dB SL at all octave frequencies. Taking a conservative approach, this value was used in the calculation of optimum initial masking level in addition to 5 dB to ensure significant threshold shift. It is recommended that 10 dB SL of initial masking level is applied in audiology clinics in Malaysia as it is adequate to effectively mask the pure tone threshold.
format	Conference or Workshop Item
author	Rahmat, Sarah Jamaluddin, Saiful Adli Dzulkarnain, Ahmad Aidil Arafat
author_facet	Rahmat, Sarah Jamaluddin, Saiful Adli Dzulkarnain, Ahmad Aidil Arafat
author_sort	Rahmat, Sarah
title	Re-evaluation of initial masking level in pure tone audiometry
title_short	Re-evaluation of initial masking level in pure tone audiometry
title_full	Re-evaluation of initial masking level in pure tone audiometry
title_fullStr	Re-evaluation of initial masking level in pure tone audiometry
title_full_unstemmed	Re-evaluation of initial masking level in pure tone audiometry
title_sort	re-evaluation of initial masking level in pure tone audiometry
publishDate	2011
url	http://irep.iium.edu.my/26743/ http://irep.iium.edu.my/26743/3/IRIIE_2.pdf
first_indexed	2023-09-18T20:39:48Z
last_indexed	2023-09-18T20:39:48Z
_version_	1777409288748138496

Re-evaluation of initial masking level in pure tone audiometry

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