Related Experiment Video
Updated: Jul 12, 2026

Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses
Published on: January 23, 2017
Hearing impairment and ear diseases among children of school entry age in rural South India
R S Phaneendra Rao1, Malavika A Subramanyam, N Sreekumaran Nair
1Department of Community Medicine, Kasturba Medical College, Manipal 576119, Karnataka, India. rsp.rao@kmc.manipal.edu
Objective:
To find out the prevalence and causes of hearing impairment among children of school-entry age, in rural areas of coastal south India.
Methods:
The study adopted the World Health Organization (WHO) guidelines viz., "The Prevalence of Ear and Hearing Disorders Protocol". A total of 855 children studying in the first year of school were examined using a Portable Pure Tone Audiometer and an Otoscope. Children with hearing impairment were re-examined to find out the type of hearing impairment. Mothers of all children were interviewed in their homes, in order to obtain details of socio-economic status, family history and history of consanguinity.
Results:
Hearing impairment was detected in 102 children (11.9%) and impacted wax was found to be the most common cause of hearing impairment (86.3%). On re-testing, it was predominantly conductive hearing impairment (81.6%) observed among 74 of these children. The prevalence of hearing impairment was significantly lower among children belonging to high socio-economic status (P=0.0036).
Conclusions:
Hearing impairment and preventable ear diseases were found to be important health problems among children of school-entry age group in this region. Regular screening of children of school-entry age will ensure that children begin their school-life without this disability.
Related Concept Videos
Hearing
Unrenewable Cells
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...

