A study of the causes of hearing loss in a population of deaf children with special reference to genetic factors

Consanguinity and Hereditary Hearing Impairment Among Saudi Population

“…The other significant result to emerge from this study is the high absolute prevalence of hereditary hearing impairment (1.7%) in comparison with less than 0.6% incidence reported by many authors [2,8]. This high prevalence may be explained, in part at least, by the widespread practice of consanguinity.…”

“…This high relative incidence of hereditary deafness may be explained by the actual increase of hereditary deafness cases due to consanguinity; also because of the efficiency of detecting the genetic deafness. Taylor et al reported that most, if not all, cases of deafness previously classified as of "unknown cause" are cases of autosomal recessive inheritance [8].…”

Hearing loss in rural population : the etiology

“…In familial hearing loss cases, Fisch (1976) reported 26.1% incidence of hearing loss. Taylor et al, (1975) found 24% incidence of hearing loss.…”

Audiological characteristics of the Monge family of Costa Rica

“…However, when Taylor et al (1975) attempted to replicate the study, they were unable to find any corresponding pattern to that described by Anderson and Wedenberg.…”

“…Frequently no cause can be determined, which results in a large number of the hearing impaired, especially children, being placed in a category for unknown etiology. This group 2 includes approximately 30 to 40 percent of all individuals who develop a significant hearing loss before the acquisition of normal speech (Bergstrom, 1981; Ruben and Rozycki, 1971;Taylor, Hine, Brasier, Chiveralls, Morris, 1975).…”