Abstract
To estimate the prevalence of hearing impairment in Mahabubnagar district, Telangana state, India. A population-based prevalence survey of hearing impairment was undertaken in 2014. Fifty-one clusters of 80 people aged 6 months and older were selected using probability-proportionate-to-size sampling. A two-stage hearing screening was conducted using otoacoustic emissions on all participants followed by pure-tone audiometry on those aged 4 years and older who failed otoacoustic emissions. Cases of hearing impairment were defined using the World Health Organization definition of disabling hearing impairment: a pure-tone average of thresholds at 500, 1000, 2000, and 4000 Hz of ≥41 dB HL for adults and ≥31 dB HL for children based on the better ear. Possible causes of hearing impairment were ascertained by a certified audiologist. Reported hearing difficulties were also measured in this survey and compared with audiometry results. Three thousand five hundred seventy-three people were examined (response rate 87%), of whom 52% were female. The prevalence of disabling hearing impairment was 4.5% [95% confidence interval (CI) = 3.8 to 5.3). Disabling hearing impairment prevalence increased with age from 0.4% in those aged 4 to 17 years...Continue Reading
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