Incidence, prevalence and etiology of hearing impairment in children in the county of Västerbotten, Sweden.
During the period 1964-83, 63,463 children were born in the county of Västerbotten, Sweden. Of these children, 160 had a hearing impairment greater than or equal to 30 dB HL mean hearing loss for the frequencies 0.5, 1.0 and 2.0 kHz in the better-hearing ear. The mean annual incidence of hearing impairment was 2.5 per 1,000 and the prevalence was 2.6 per 1,000. Hereditary factors were present in 46% and no etiology could be established in 34% of the cases. The incidence of hearing impairment was greater than has been presented in studies from other areas in Europe.
Sehlin
P
P
Department of Audiology, University of Umeå, Sweden.
Holmgren
G
G
Zakrisson
J
J
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D006311:Hearing Disorders / Q000453:epidemiology / Q000209:etiology / Q000235:genetics; D006319:Hearing Loss, Sensorineural / Q000453:epidemiology; D006801:Humans; D007223:Infant; D008297:Male; D010375:Pedigree; D011795:Surveys and Questionnaires; D013548:Sweden / Q000453:epidemiology; D013577:Syndrome