Hearing 1983

Hearing at 14 years.

Number of cases
Data obtained: N = 665

Data collection
Hearing status was researced from 14-year olds by health incuiry. Only those with hearing impairments and about 1000 controls were included. Audiometric studies were asked from schools.

The study population originates from a birth cohort for 1966 (Rantakallio, 1969, 1973, 1985). Follow-up data on the mental and physical development of the children were collected at various ages, the latest survey being in 1980 and 1981, representing an age of 14 years. Out of 12 058 live birtsh, 11 780 of the children were alive at 14 years of age and the untraced cases numbered 14, 1.2 per 1 000 (Rantakallio, 1985). At the follow-up the hearing of the children was inguired upon in a guestionnaire addressed to the child and family, and in the cases of non-respondents to the school health officers, or to the institution, hospital, etc. responsible for the child's medical care if not at school. In 6 cases, 0.6 per 1 000, it was not possible to get a report on the child's hearing, including two mentally retarded children.

Results of an audiometry screening routinely performed on school children were asked for from the school health offices in the case of the 425 children who were reported to have hearing problems and of 1 000 children chosen by random sampling from those reported to have normal hearing. If the child was not at school the data were obtained from the public health authorities responsible for the child's health care. Audiometry results were obtained from 959 children, 95.9%, out of the random sample of healthy children and for 413, 97.2%, of those with reported impaired hearing.

Questionnaire form (in finnish)

The variable list

Audiogram 400 with impaired hearing, about 1000 normal hearing.

Main article
Sorri M., Rantakallio P.: Prevalence of hearing loss at the age of 15 in a birth cohort of 12 000 children from Northern Finland. Scand. Audiol. 1985, 14: 203-207.

Last updated: 10.7.2020