W Mulwafu1, H Kuper2, R J H Ensink3. 1. College of Medicine, Blantyre, Malawi. 2. International Centre for Evidence in Disability, London School of Hygiene and Tropical Medicine, London, UK. 3. Gelre Hospitals Zutphen, Zutphen, The Netherlands.
Abstract
OBJECTIVE: To systematically assess the data on the prevalence and causes of hearing impairment in Africa. METHODS: Systematic review on the prevalence and causes of hearing loss in Africa. We undertook a literature search of seven electronic databases (EMBASE, PubMed, Medline, Global Health, Web of Knowledge, Academic Search Complete and Africa Wide Information) and manually searched bibliographies of included articles. The search was restricted to population-based studies on hearing impairment in Africa. Data were extracted using a standard protocol. RESULTS: We identified 232 articles and included 28 articles in the final analysis. The most common cut-offs used for hearing impairment were 25 and 30 dB HL, but this ranged between 15 and 40 dB HL. For a cut-off of 25 dB, the median was 7.7% for the children- or school-based studies and 17% for population-based studies. For a cut-off of 30 dB HL, the median was 6.6% for the children or school-based studies and 31% for population-based studies. In schools for the deaf, the most common cause of hearing impairment was cryptogenic deafness (50%) followed by infectious causes (43%). In mainstream schools and general population, the most common cause of hearing impairment was middle ear disease (36%), followed by undetermined causes (35%) and cerumen impaction (24%). CONCLUSION: There are very few population-based studies available to estimate the prevalence of hearing impairment in Africa. Those studies that are available use different cut-offs, making comparison difficult. However, the evidence suggests that the prevalence of hearing impairment is high and that much of it is avoidable or treatable.
OBJECTIVE: To systematically assess the data on the prevalence and causes of hearing impairment in Africa. METHODS: Systematic review on the prevalence and causes of hearing loss in Africa. We undertook a literature search of seven electronic databases (EMBASE, PubMed, Medline, Global Health, Web of Knowledge, Academic Search Complete and Africa Wide Information) and manually searched bibliographies of included articles. The search was restricted to population-based studies on hearing impairment in Africa. Data were extracted using a standard protocol. RESULTS: We identified 232 articles and included 28 articles in the final analysis. The most common cut-offs used for hearing impairment were 25 and 30 dB HL, but this ranged between 15 and 40 dB HL. For a cut-off of 25 dB, the median was 7.7% for the children- or school-based studies and 17% for population-based studies. For a cut-off of 30 dB HL, the median was 6.6% for the children or school-based studies and 31% for population-based studies. In schools for the deaf, the most common cause of hearing impairment was cryptogenic deafness (50%) followed by infectious causes (43%). In mainstream schools and general population, the most common cause of hearing impairment was middle ear disease (36%), followed by undetermined causes (35%) and cerumen impaction (24%). CONCLUSION: There are very few population-based studies available to estimate the prevalence of hearing impairment in Africa. Those studies that are available use different cut-offs, making comparison difficult. However, the evidence suggests that the prevalence of hearing impairment is high and that much of it is avoidable or treatable.
Authors: Chunfeng Yun; Zhenjie Wang; Jiamin Gao; Ping He; Chao Guo; Gong Chen; Xiaoying Zheng Journal: Int J Environ Res Public Health Date: 2017-01-18 Impact factor: 3.390
Authors: Oluwafemi G Oluwole; Kevin K Esoh; Edmond Wonkam-Tingang; Noluthando Manyisa; Jean Jacques Noubiap; Emile R Chimusa; Ambroise Wonkam Journal: Exp Biol Med (Maywood) Date: 2020-09-30
Authors: Luke Hunt; Wakisa Mulwafu; Victoria Knott; Chifundo B Ndamala; Andrew W Naunje; Sam Dewhurst; Andrew Hall; Kevin Mortimer Journal: PLoS One Date: 2017-12-21 Impact factor: 3.240
Authors: Francis M Banda; Kathleen M Powis; Agnes B Mokoka; Moalosi Mmapetla; Katherine D Westmoreland; Thuso David; Andrew P Steenhoff Journal: Glob Pediatr Health Date: 2018-04-20