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WHO estimates that globally the number of people with hearing loss, defined as a loss of more than 40 dB on the hearing loss scale (> 40 dB HL), has more than doubled from 120 million in 1995 to at least 278 million in 2005, thus making this condition the most prevalent sensory deficit in the population.1–3 Permanent hearing loss can occur at any age but about 25% of the current burden is of childhood onset. Annually, up to 6 per 1000 live-born infants, or 798 000 babies worldwide, suffer permanent hearing loss at birth or within the neonatal period and at least 90% of them are in developing countries
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