Schoolchildren and noise. The 4 kHz dip-tone screening in 14391 Schoolchildren

Author(s): Rytzner, C.

Journal/Book: Scand Audiol. 1981; 10: 213-6.

Abstract: Tone screening was performed in 14391 schoolchildren at three different age-levels, 7, 10, 13 years in grades 1, 4 and 7, and was carried out in 1977, 1978 and 1979. A 4 kHz dip greater than 20 dB was found in 331 (2.3%) of the children; 241 (1.7%) were boys and 98 (0.6%) were girls. The 4 kHz dip was unilateral in 230 (1.6%) and bilateral in 109 children (0.7%). The number of children with the 4 kHz dip increased with age. At the 13-year level it was found in 125 (4.7%) boys and 37 (1.5%) girls. The magnitude of the dip increased with age both in frequency range and intensity. At the 13-year level two and more frequencies were affected in 27 (0.5%) and hearing thresholds of 40 dB and worse were found in 47 (0.9%) of the children. Causes of noise could be established in 210 (63%) of 331 children. Most important noise causes were in the following order: motor vehicles, including tractors, fire-arms and crackers. In a small number, loud music could have been the cause of the 4 kHz dip. A hearing conservation program against noise has been instituted for children, parents, teachers and school nurses. Further studies will show if this program is effective.

Note: Using Smart Source Parsing

Keyword(s): Adolescence. Audiometry, Pure-Tone. Child. Female. Hearing Loss, High-Frequency/epidemiology/etiology. Hearing Loss, Noise-Induced/epidemiology/etiology. Hearing Loss, Partial/epidemiology. Human. Male. Mass Screening/methods. School Health Services. Sex Factors

Zurück | Weiter