Abstract
BackgroundThere is evidence that the factors contributing to the prevalence and aetiology of hearing impairment vary widely from one country to another. In South Africa, as in other low-income and middle-income countries, more context-specific information on the estimated prevalence of hearing impairment and the factors that contribute to its onset is required.AimThe aim of this study was to provide decision-makers and hearing health professionals with local and accurate information on the prevalence of ear and hearing disorders in the Elias Motsoaledi Local Municipal (EMLM) area of the Limpopo province, South Africa.MethodsThe World Health Organization (WHO) protocol for population-based surveys of prevalence and causes of deafness, hearing impairment and other ear diseases was utilised. A random multi-stage cluster sampling strategy, two-stage sampling, was utilised to select the seven municipal wards and 357 households through the probability proportional to size method. A total of 850 participants were included in the study.ResultsThe overall prevalence of hearing impairment was 19.88% (95% confidence interval [CI]: 0.15–0.2) and 8.94 (95% CI: 0.08–0.12) for disabling hearing impairment. The prevalence of ear disease was 13.19% (95% CI: 0.10–0.15), with impacted cerumen and otitis media reported most often. Associations with hearing impairment were established for age, gender and hypertension.ConclusionThe study has shown a higher prevalence of disabling hearing impairment in the rural EMLM area of the Limpopo province compared to global prevalence rates. In addition, known factors associated with hearing impairment were confirmed.
Highlights
There is evidence that the factors contributing to the prevalence and aetiology of hearing impairment vary widely from one country to another
Most notable is the significant association between hearing impairment and advanced age, which is attributed to increased mean life expectancy in many countries (GBD, 2016; Lin, Thorpe, Gordon-Salant, & Ferrucci, 2011; Olusanya et al, 2014; World Health Organization [WHO], 2018; Wilson et al, 2017)
Because of the nature of the screening measures (DPOAE and automated auditory brainstem response (AABR)) used for children 0–3.11 years of age, it was not possible to differentiate between the degrees of hearing impairment
Summary
There is evidence that the factors contributing to the prevalence and aetiology of hearing impairment vary widely from one country to another. Global estimates indicate that the prevalence of disabling hearing impairment has increased from 5.73% in 2005 to 6.12% in 2018 (WHO, 2018). Ranked as the fourth leading contributor of YLD, has become a major global health concern (Wilson et al, 2017). Several factors contribute to the increased global prevalence estimates of disabling hearing impairment. Most notable is the significant association between hearing impairment and advanced age, which is attributed to increased mean life expectancy in many countries (GBD, 2016; Lin, Thorpe, Gordon-Salant, & Ferrucci, 2011; Olusanya et al, 2014; World Health Organization [WHO], 2018; Wilson et al, 2017). Other risk factors for hearing impairment (from prenatal through to adulthood) are outlined by Olusanya et al (2014)
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