Abstract
Background
It is estimated that about 15% of students have transient hearing loss worldwide sufficient enough to interfere with communication, psychosocial relationship, and learning resulting in poor educational achievement and poverty. However, these conditions are reversible through timely detection and effective interventions. India is home to the largest number of school age children with hearing impairment, and majority of them remain undetected and untreated due to the absence of any dedicated hearing screening program. Therefore, this paper attempts to convince all stakeholders for planning and implementing early detection and intervention program for children with hearing impairment in school settings.
Methods
Recent literature estimates that children between the ages 0 and 14 years contribute 25.9% of the total Indian population. As per the global estimates of the prevalence of hearing impairment, India houses the largest number of school age children with hearing impairment. Many of them either remain out of school or perform poorly in school curriculum.
Results
The children in educational programs are readily and easily available for applying hearing screening procedures to detect hearing impairment and instituting audiological and educational remedial measures. But unfortunately, India has not yet envisaged any dedicated early detection and intervention program for school-going children consequently majority of children with hearing impairment undetected and untreated in the classroom.
Conclusion
Hearing impairment is a serious health concern among school age children which can adversely impact on communication, educational achievement, and vocational options. However, screening approaches for early identification in school age children across the world which are simple, effective, and cost-efficient can be considered for countries like India to reverse the ill effects of hearing impairment.
Potential implication
The paper may heighten the awareness among school personnel, educational administrators, and policymakers to consider planning and implementation of early detection and intervention program for children with hearing impairment in school settings.
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Hearing impairment is a serious health concern in countries like India. The hearing impairment isolates an individual from the learning environment that results in breakdown in the linkages for development of speech and language, academic performances, cognitive abilities, and emotional and psychosocial well-being of the child as well as family members [1]. Hearing disorder is manifested in many forms and magnitudes and can occur at all life stages. It can be sensorineural, conductive, mixed, central auditory processing, and functional in nature. Hearing loss could vary from mild loss to profound (pure tone average 26 to 91 dBHL and above) degree. It could be either in one ear or both ears [2].
The disorders of the external and middle ear result in conductive hearing loss, which in turn reduces the amount of sound reaching to the inner ear. The disease of cochlea or cochlear nerve results in sensorineural hearing loss. Such people not only receive the attenuated sound energy but also the distorted quality of sound including speech. The disorder of the central auditory system is more subtle and complex. Northern and Down (2002) reported that children with central auditory processing difficulties may have normal hearing on pure tone audiometry. However, they often manifest poor discrimination ability to understand speech in degraded listening environment such as background noise or presence of competing messages [2, 3].
Hearing impairment of severe to profound degree at birth or acquired during schooling period affects the child’s ability to acquire or develop speech-language skills and scholastic performances to great extent. The children even with a moderate degree of hearing loss may behave like severely deaf in the presence of noise especially in classroom situation and perform poorly on scholastic activities [3]. Hence, the school hearing screening programs are assuming major importance in early detection of hearing loss of varying degrees in school age children. The identification of hearing changes often makes it possible to implement corrective actions and to prevent from further deteriorations.
Magnitude of the problem
There are about 466 million people who have disabling hearing loss, and 34 million of these are children globally. The disabling hearing loss refers to hearing loss greater than 30 dB in the better hearing ear in children and about 80% of people with disabling hearing loss who live in low- and middle-income countries (LMICs) as defined by the World Bank [4]. In LMICs, approximately 7.5 million children (about 6 per 1000 live births) have disabling sensorineural hearing impairment [5, 6].
The Census of India (2011) reports that hearing impairment affects about 5.07 million and 1.98 million of the populations with various types of speech problems almost uniformly distributed around the country [7]. Pascolini and Smith reported bilateral severe to profound hearing loss affect more than 10 infants in every 1000 live births in developing countries [8]. Niskar et al. found 14.9% of children with either low-frequency or high-frequency hearing loss in a hospital-based survey [9]. Norman et al. reported the prevalence of hearing impairment to be 30.9% in school children (aged 8–14 years) in the villages of Vadamavanthal, Tamil Nadu [10].
The Census of India (2011) reports that one in every 100 children in the age group 0–6 years suffered from some type of disability. 20.42 lakhs (2.42 million) children aged 0–6 years are disabled and among them, 23% are having disability in hearing. Furthermore, out of the total disabled (7.87 million) in the age group 0–19 years, 20% are hearing disabled. The disabled persons are highest (4.62 million) in the age group 10–19 years. The disabled children aged 5–19 years who are attending educational institution are found to be only 61% [11]. According to recent data from the sample registration survey of India (SRS: 2018), the children between the ages of 0 and 14 years made up 25.9% of the population [12]. Thus, considering the prevalence rate of hearing impairment in this age segment, it can be assumed that the world’s largest school age child population with hearing disability reside in India.
These children are easily and readily available in schools for hearing screening and to provide appropriate technological rehabilitation, speech training, and educational facilities for their optimal growth. But these children remained undetected and untreated in the classroom as India has not yet envisaged any dedicated early hearing detection and intervention program. As a result, majority of these children suffer from poor scholastic achievement and socioeconomic insufficiency leading to poor illiteracy and poverty among them. This necessitates the identification of hearing impairment in children and to provide them rehabilitative and educational services ensured in Right to Person with Disabilities Act – 2016 [13] and Right to Education Act – 2009 [14]. Therefore, this paper endeavors to convince all stakeholders by addressing the need, significance, and justification for planning and implementing early detection and intervention program for children in the school setting. It also intends to suggest hearing screening approaches for application.
Hearing screening
Hearing screening is a rapid, cost-effective, and accurate method designed to picking out those individuals most likely to have a hearing impairment that may interfere with communication or educational development [2]. Hearing screening programs do not assess the deficit but use the pass/fail criteria to group those warranting further evaluation. The goal of a hearing screening is to identify children with hearing loss in order to allow for further diagnosis and intervention [15]. It should be relatively simple to perform, require minimal preparation, and be cost-efficient [2, 16]. Hearing screening methods for school-going children are simple, appropriate, and efficient for the identification of hearing loss.
Need of screening in school going children
Hearing deficits of severe to profound degree in children can interfere with oral communication, language and psycho-social development, and classroom learning. The child who is hard of hearing or deaf receives the remedial services at an early age, he/she is more likely to achieve optimal speech, language, and social skill acquisition [17]. However, children with a lesser degree of hearing loss, i.e., mild to moderate hearing problems, are forgotten children in schools, as teachers are rarely aware of the presence of hearing impairment in child in classrooms. These children if remained undetected may be at a disadvantage educationally, emotionally, and socially and may behave like severely hearing-impaired children [18, 19]. This necessitates an early detection of mild-moderate hearing loss to provide effective medical treatment and to compensate for the loss through amplification.
Children with mild to moderate degrees of losses often go undetected by family members and teachers and may lead to the child being labeled as a daydreamer, slow learner, inattentive and disobedient, etc. [19]. They often have peer relationship issues and suffer from low self-esteem [20, 21]. However, these conditions are preventable and ameliorable through early detection and intervention and specialized educational services. These students may be provided with amplification devices, auditory training, speech conservation, and speech-language therapy, etc. In addition, guidance and counseling for teachers, parents, and hard of hearing can be facilitated [22].
Significance of screening school going children
Hearing is one of the essential doorways of learning. The loss of hearing sensitivity of any degree compromises effective learning as all formal learning and educational activities in school environments are mediated through the sense of hearing. Hearing screening for school going children offers the following advantages [22, 23]:
• Good number of school children of various ages are easily accessible and readily available for hearing screening in the school environment.
• School hearing screening program offers the opportunity to screen children who have progressive hearing loss or inflected the hearing loss later or could not be previously screened or identified.
Hearing screening can be conducted in a relatively short period of time with more ease:
• Hearing screening strategies are far less expensive than comparable services performed in another sector of the health care system.
• School hearing screening program provides continuing prospect to observe, evaluate, and examine potential areas of concern.
Approaches for school hearing screening
It is estimated that up to 15% of students exhibit at least a transient hearing loss at some time during their school years sufficient enough to interfere with education [22]. Thus, educationally significant hearing loss (ESHL) is the target disorder for school age hearing screening that could potentially interfere with a learner’s academic performance. ESHL is specified as a threshold > 20 dB HL at 1, 2, or 4 kHz in either ear [23]. ESHL may include sensorineural, conductive, or mixed hearing loss and may also include transient conductive losses. Hearing screening programs should be initiated for pre-school or school age children to favor equal educational opportunities who suffer from communication disorders [24].
A systematic screening program with correct equipment, trained personnel, and adequate follow-up services will allow children with ESHL to be accurately diagnosed and managed to provide them with learning opportunities. Thus, ongoing review of hearing and speech age-appropriate milestones, risk factors, and routine hearing screening is critical to detect the hearing impairment. The commonly employed strategies are pure tone audiometric screening, acoustic immittance screening, high-risk register criteria, and Behavioral Checklist & Health History Questionnaire, etc.
Pure tone audiometric screening
The most accepted method of screening hearing in school-going children is pure tone audiometry along with immittance audiometry to identify the children with middle ear disease and to supplement the information obtained in pure tone hearing screening [23, 25]. Pure tone audiometry is conducted at 1000 Hz, 2000 Hz, and 4000 Hz; when an immittance procedure is not used, 500 Hz may also be considered for screening. Each ear of students is screened at 20 dBHL in a controlled environment with appropriate instruction to raise the hand each time the tone is presented at a specific frequency.
The pure tone audiometry is the most frequently used audiological tool for deciding medical, surgical, or rehabilitative strategies and monitoring benefit with interventions. The recommended follow-up pure tone audiometry is as follows:
Every 3 months - during the first year of diagnosis.
Every 6 months - during preschool years.
Every year - while in school.
Acoustic immittance measurement
Acoustic immittance incorporates two procedures, tympanometry, and acoustic reflex. Tympanometry measures change in acoustic impedance or admittance at the eardrum. The air pressure changes usually from + 200 dapa to − 300 dapa are artificially induced into a hermitically sealed ear canal in the presence of tone frequency of 226 Hz at 85 dBHL [25]. Acoustic reflex screening procedure measures a change in acoustic impedance or admittance at the lateral surface of the eardrum with the delivery of tone intensity of 105 dBHL at 1000 Hz [26]. The presence of “A” type tympanogram and acoustic reflex to tone intensity 105 dBHL at 1000 Hz is considered as normal integrity of the auditory system for sound transmission to the inner ear and beyond.
Behavioral checklist
Observing the behaviors of the child as certain peculiar behaviors or traits may suggest the presence of hearing loss in the child [27]. These traits can be of great help or source in suspecting hearing health of school-going children. The commonly cited behaviors include the following:
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Peculiar listening behaviors such as cupping the ear, cocking the head, leaning forward to listen, turning the head to localize sound with the better ear, effortful and stressful facial expression
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Lack of attention
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Attention-seeking behaviors
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Frequent request for repetition of what has been said
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Poor at dictation
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Irrelevant answers to the question
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Frequent mistakes in carrying out the oral instruction
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Speech defects
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Restlessness and listening fatigue
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Poor scholastic performances
If any of these behavior or combinations of behaviors are present in the child, he/she can be suspected of some problem in hearing. The family members can play a major role in suspecting hearing loss, as they are in best position to interact with the child and observe the auditory behavior and other related traits. The major concern is to create awareness among family members and teachers to identify such children, so that suspected children could be referred and can be given comprehensive audiological tests and appropriate intervention thereupon.
Children with unilateral or lesser degree of hearing loss do not find much difficulty in receiving conversational speech. However, the children may find difficulty in sustaining attention in the classroom especially when the background noise is at a high level. In such situations, the hearing-impaired child may exhibit some specific patterns of behavior, and these patterns may become the family’s concern, not the hearing. The family members’ concern about the child’s inattentiveness, poor at studies, or repeated ear infections to physician or family doctor should be doubted as a potential case for hearing impairment.
High-risk registry of hearing loss
High risk students of hearing loss [18, 20, 21, 28, 29] in schools are those who:
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Repeat a grade.
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Are enrolled in special/ exceptional educational program.
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Are new to the school system (integrated child).
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Failed the threshold test during the previous year.
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Child was absent during the previously scheduled hearing screening.
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Have speech and language problems and obvious problems in communication.
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Have medical problems commonly associated with hearing impairment.
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Are involved in coursework that places them at risk for noise exposure like, woodworking, band and auto mechanic, etc.
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Previously documented hearing impairment.
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Having a family history of deafness.
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Long-term absentee from school because of major illness.
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Recurrent middle ear infection.
If these high-risk children are made known to parents, teachers, and other school personals, it will alert them regarding the child’s auditory behaviors which may facilitate early identification and subsequent referral for audiological assessment. Furthermore, physicians, pediatricians, and otolaryngologists may play a major role in identifying and subsequent referral of children with high-risk registers, syndromic and medical condition, and medical treatment that may cause hearing loss, so that the hearing specialist may conduct the suitable test to ascertain audiological profile [30].
It is advisable to perform an audiogram on all such children, but even in absence of an audiometer, the wealth of information by means of 512 Hz simple tuning fork test and speech test can be obtained by asking simple questions softly and asking the child to repeat words or phrases that a normal child should be able to hear. If a child repeats soft-spoken words properly, it may indicate near-normal hearing, but it must always bear in mind that many times children hear and yet do not respond. If it is assumed that the responses are reliable, and the child fails to hear soft voices/sounds. The physician then should use a 512-Hz tuning fork to find out whether the impairment is conductive or sensorineural and to apply effective treatment. If the physician is unable to suggest proper treatment, it is his obligation to refer the child to an otologist or hearing clinic for required medical, surgical, or rehabilitative services.
Scenario in the country
India is home to the highest number of children with hearing impairment in the world. 1.57 million children are hearing disabled in the educable age group 0–19 years. The number of disabled children is highest in the age group 10–19 years (4.62 million). 4.01 million (61%) out of 6.58 million disabled children aged 5–19 years are attending educational institutions, and only 60% of those who attend school complete class 10. As the per India Social Development Report – 2016, there are about 75 million children of primary school age who are out of school, among them “one-third are children with disabilities.” Further, only 2% of the PWDs were enrolled in any vocational course [31].
269.8 million or 21.9% of the Indian population are poor whereas poverty in the disabled population is about 30–40% [32]. One in every two disabled non-workers is dependent on their respective families. These numbers are a reminder that India is still a long way from meeting goal 4 of the United Nation’s Sustainable Development Goals (UNSDGs) of ensuring “inclusive and equitable quality education” and “lifelong learning opportunities for all” by 2030 [33].
The reasons may be found in the report of the 76th round of the National Sample Survey 2019 which states 76.4% of persons with disabilities have not received any kind of aid and appliances from the government, and only 28.8% have a disability certificate from a competent authority essential for availing subsidized hearing aid and cochlear implant and other facilities. About 89.8% of children with disabilities do not have access or could not receive pre-school intervention services [34]. Thus, the lack of timely detection of hearing impairment, inability to purchase or obtain assistive technologies and learning materials, and inaccessible intervention services probably are factors for the high rate of literacy and poverty in the disabled population.
Illiteracy and poverty among the disabled have inexorable concerns, as illiterate and poor are more susceptible to ill health, exploitation, and human rights abuses [35]. Poverty has been the cause of persistent illiteracy, poor health, and many preventable diseases that have the potential to cause hearing impairment. Since literacy and health are essential indicators of the quality of a country’s human capital, these are probably the pertinent reasons why India still ranks low in most of the global human capital indices [36]. If we intend to eradicate the illiteracy and poverty among the disabled population, we must detect hearing loss at the earliest and provide effective remedial measures.
Challenges in early detection of hearing impairment
Hearing impairment is a matter of serious concern as it has wider implications on health and education on a huge number of children in schools. The school-going children with hearing impairment are spread and living over 3288 million km2 of land, in 718 districts across 28 states and 9 union territories in our country. Moreover, there is scarcity of manpower for the early diagnosis and intervention for hearing impairment [12]. As per WHO (2009), ENT specialists and audiologists in India are about 8000 and 2500 in numbers, respectively. The audiologist versus population ratio was found to be 1:500,000 and the ratio of speech therapists or special educator to the deaf population is 1:200 [37]. There are around 5000 speech pathologist and audiologist (SLPAs) in India. Further, there is also a misdistribution of personnel with more hearing health care professionals who are working in urban areas than in rural and suburb regions [38]. In addition to these problems, the facilities for dissemination of information to create awareness in the public, policymakers, administrators, and academics are also inadequate.
Opportunities for early detection of hearing impairment
India has a very impressive infrastructure for disseminating primary health care and rehabilitation services. There are nine national institutes which are engaged in human resources development, delivery of rehabilitation services to the persons with disabilities, dissemination of information and documentation, and research and development in the field of disability. There are 19 composite regional centers that have been established for persons with disabilities in various states to provide both preventive and promotional aspects of rehabilitation like education, health, employment and vocational training, research, and manpower development. The comprehensive services and capacity building to the persons with disabilities are augmented by 262 district disability rehabilitation center across the country [39].
There are 3907 ICDS projects covering nearly 70% of the country’s community development blocks and 260 urban slum pockets. Rural health services are facilitated by 1, 31,900 health subcenters, each for every 5000 population in plain and 3000 population in tribal areas. There are 21,693 primary health centers for 30,000 populations in plain and 20,000 populations in tribal/hilly areas. There are 2385 upgraded community health center to cover 80,000 to 1.20-lakh populations [39]. Each of these centers has gramsevikas, anganwadi workers, multipurpose workers, health workers, viklangbandhus, nurses, etc., and many other governmental and non-governmental organizations equipped with men and materials to take up early detection programs.
The Artificial Limbs Manufacturing Corporation (ALIMCO) is a Central Public Sector for the manufacture and supply/distribution of Assistive Devices for Persons with Disabilities. It has provided about 42 lakhs of assistive device to PwDs across the country. The National Handicapped Finance and Development Corporation (NHFDC) provides financial loan up to 25.0 lakh at 5–8% interest rate for setting up income-generating activities. Educational loan is also available for pursuing higher education, i.e., graduation, post-graduation professional courses. The maximum amount of loan is Rs.10.0 lakh within India and Rs.20.0 lakh for courses abroad. The rate of interest is 4% per annum (rebate of 0.5% on interest is allowed to women beneficiaries) [39].
Conclusions
The curricular and extracurricular educational and academic activities in school environments are mediated through the sense of hearing. Hence, hearing impairment of any degree compromises effective learning in the school environment resulting in poor academic performance in children with hearing impairment that may have future ramifications on employment socioeconomic status [29]. However, identification of hearing impairment of pre-school or school age children and providing appropriate intervention can help to enhance academic performance and improve the employability and quality of life.
Therefore, hearing screening programs should be initiated to support equal educational and learning opportunities for children who suffer from communication disorders due to hearing impairment in school programs. A methodical and planned hearing screening program will allow to accurately diagnose the educationally significant hearing loss and to provide appropriate intervention in form of amplification devices, speech-language therapy, and other educational remedial measures in order to ensure equitable and inclusive learning opportunities enshrined in the RTE Act - 2009 and RPWD-Act 2016 and echoed in the Draft National Education Policy (NEP) 2019. The NEP has recommended setting up Disability-Inclusive Fund to build the nation’s capacity by providing equitable quality and inclusive education for all [40].
A methodical screening program will allow children with ESHL to be accurately diagnosed and managed to provide them with equal learning opportunities. This has been ensured in the RTE Act − 2009, RPWD-Act 2016 and echoed by the Draft National Education Policy 2019 which recommends setting up Disability-Inclusive Fund to build the nation’s capacity to provide quality and equitable education for all [40].
Hearing impairment can be identified by simple, reliable, and cost-effective methods such as family/hearing health questionnaire, risk registers, pure tone audiometry, and acoustic immittance measurement which are efficient and cost-effective. The children with suspected hearing impairment may be referred for diagnosis and intervention. In spite India has a gigantic population of children with hearing impairment in the educable group and these children are readily available for detection of hearing impairment, but unfortunately, India does not have any dedicated program for early identification and intervention in school settings as yet.
Furthermore, planning and implementation of a hearing screening program in school will heighten the awareness about hearing care and hearing health among school administrators, teachers, parents, and students. This will promote hearing health care values in them. Thus, there is an urgent need for planning and implementation of early identification and intervention program for hearing in school settings for children in particular and other school personnel in general.
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I submit my sincere thanks to all individuals with hearing impairment and deafness who influenced my thoughts for writing the article.
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Ansari, M.S. Hearing screening program for school going children in India: necessity, justification, and suggested approaches. Egypt J Otolaryngol 37, 118 (2021). https://doi.org/10.1186/s43163-021-00182-x
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DOI: https://doi.org/10.1186/s43163-021-00182-x