Development and evaluation of a free-field voice test for potential use as a community screening tool for hearing impairment in children

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dc.contributor.advisorPrescott, C A Jen_ZA
dc.contributor.advisorOgilvy, Daleen_ZA
dc.contributor.authorOmoding, Sammy Sen_ZA
dc.date.accessioned2018-01-24T11:48:01Z
dc.date.available2018-01-24T11:48:01Z
dc.date.issued1999en_ZA
dc.description.abstractEarly identification of hearing impairment in children is essential to avoid potentially disabling effects of hearing loss or deafness. This necessitates effective screening measures appropriate to the community in question. Current methods used in South Africa, especially for pre-school and school going children have resulted in poor coverage as they are designed for the more developed countries. There is thus a need to devise a screening method that is appropriate to our local conditions. In this study, a free-field live voice test was developed based on three levels: whisper, conversational and loud. This was evaluated against pure tone audiometry for sensitivity, specificity, cost and ease of application in two studies: hospital and school- based. A total of 394 children were tested; 189 in hospital-based study and 205 in school based study. 378 of the total were eligible for analysis. In the hospital-based study, the results of 177 children were analysed. The age range was 3 - 12 years with a mean of 5.8 years. The sensitivity (ability of the test to detect hearing impairment) was 80.0%; and the specificity (ability to identify children with normal hearing) was 95.0%. In the school-based study, done after modification and standardisation of the test set, the sensitivity and specificity were 83.3% and 97.8% respectively. Age range was 3 - 8 years with 79% being 4- 6 years. In both studies, the voice test was simpler to perform, easily understood and acceptable to the children and the testers; and considerably cheaper as the only equipment required was picture/toy set. The main limitation was non-standardisation of the test set. This was rectified in the school-based study. The drawbacks noted were the inability of the voice test to detect unilateral hearing loss/deafness and high frequency hearing loss. The voice test generally correlated well with pure tone audiometry and could be used as alternative for screening for hearing impairment in the community especially for pre-school and school going children. However, it is recommended to repeat the study in actual community settings using Community Health Care Workers as the testers. This would also determine the reliability of the voice test, as this cannot be reliably established at this stage.en_ZA
dc.identifier.apacitationOmoding, S. S. (1999). <i>Development and evaluation of a free-field voice test for potential use as a community screening tool for hearing impairment in children</i>. (Thesis). University of Cape Town ,Faculty of Health Sciences ,Division of Otorhinolaryngology. Retrieved from http://hdl.handle.net/11427/26923en_ZA
dc.identifier.chicagocitationOmoding, Sammy S. <i>"Development and evaluation of a free-field voice test for potential use as a community screening tool for hearing impairment in children."</i> Thesis., University of Cape Town ,Faculty of Health Sciences ,Division of Otorhinolaryngology, 1999. http://hdl.handle.net/11427/26923en_ZA
dc.identifier.citationOmoding, S. 1999. Development and evaluation of a free-field voice test for potential use as a community screening tool for hearing impairment in children. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Omoding, Sammy S AB - Early identification of hearing impairment in children is essential to avoid potentially disabling effects of hearing loss or deafness. This necessitates effective screening measures appropriate to the community in question. Current methods used in South Africa, especially for pre-school and school going children have resulted in poor coverage as they are designed for the more developed countries. There is thus a need to devise a screening method that is appropriate to our local conditions. In this study, a free-field live voice test was developed based on three levels: whisper, conversational and loud. This was evaluated against pure tone audiometry for sensitivity, specificity, cost and ease of application in two studies: hospital and school- based. A total of 394 children were tested; 189 in hospital-based study and 205 in school based study. 378 of the total were eligible for analysis. In the hospital-based study, the results of 177 children were analysed. The age range was 3 - 12 years with a mean of 5.8 years. The sensitivity (ability of the test to detect hearing impairment) was 80.0%; and the specificity (ability to identify children with normal hearing) was 95.0%. In the school-based study, done after modification and standardisation of the test set, the sensitivity and specificity were 83.3% and 97.8% respectively. Age range was 3 - 8 years with 79% being 4- 6 years. In both studies, the voice test was simpler to perform, easily understood and acceptable to the children and the testers; and considerably cheaper as the only equipment required was picture/toy set. The main limitation was non-standardisation of the test set. This was rectified in the school-based study. The drawbacks noted were the inability of the voice test to detect unilateral hearing loss/deafness and high frequency hearing loss. The voice test generally correlated well with pure tone audiometry and could be used as alternative for screening for hearing impairment in the community especially for pre-school and school going children. However, it is recommended to repeat the study in actual community settings using Community Health Care Workers as the testers. This would also determine the reliability of the voice test, as this cannot be reliably established at this stage. DA - 1999 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1999 T1 - Development and evaluation of a free-field voice test for potential use as a community screening tool for hearing impairment in children TI - Development and evaluation of a free-field voice test for potential use as a community screening tool for hearing impairment in children UR - http://hdl.handle.net/11427/26923 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/26923
dc.identifier.vancouvercitationOmoding SS. Development and evaluation of a free-field voice test for potential use as a community screening tool for hearing impairment in children. [Thesis]. University of Cape Town ,Faculty of Health Sciences ,Division of Otorhinolaryngology, 1999 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/26923en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDivision of Otorhinolaryngologyen_ZA
dc.publisher.facultyFaculty of Health Sciencesen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherOtorhinolaryngologyen_ZA
dc.subject.otherLogopaedicsen_ZA
dc.titleDevelopment and evaluation of a free-field voice test for potential use as a community screening tool for hearing impairment in childrenen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMMeden_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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