表題番号：2025Q-031 日付：2026/03/23
研究課題ISO 7029:2017（聴覚閾値の年齢別・男女別統計的分布）改訂に向けた基準聴覚閾値の推定
研究者所属（当時） 資格 氏名
（代表者） 人間科学学術院 人間科学部 教授 倉片　憲治
研究成果概要
This study was conducted as a follow-up to the Grant-in-Aid for Scientific Research (KAKENHI) project, “Early Detection of Earphone-Induced Hearing Loss and Identification of Risk Factors through Improvement of Extended High-Frequency Audiometry,” which had been carried out through fiscal year 2024. In addition to the pure-tone air-conduction audiometric data obtained in that project, new data were collected to estimate reference hearing thresholds and to advance preparations for drafting a proposed revision of an International Standard, ISO 7029:2017 “Statistical distribution of hearing thresholds related to age and gender”.
This study addressed the following two tasks:
(1) collection of hearing measurement data using extended high-frequency audiometry; and
(2) collection of published literature reporting hearing measurement data for individuals under 18 years of age.
First, for Task (1), hearing measurements were conducted for eight otologically normal young adults aged 20 to 22 years. As a result, together with the data collected in the above-mentioned KAKENHI project, a total of valid data from 58 participants were obtained.
Next, for Task (2), a careful review of the domestic and international literature identified 15 relevant publications, from which valid data for more than 3,700 individuals were collected. By making use of these data, it was demonstrated that, in the proposed revision of ISO 7029, reference hearing thresholds can be estimated for individuals under 18 years of age. These results were presented at the 154th Meeting of the Acoustical Society of Japan, held in Sendai in September 2025, under the title: “Developmental Changes in Air-Conduction Pure-Tone Hearing in Children.”
As described above, the intended objectives of this study were successfully achieved.
Furthermore, a new Grant in Aid for Scientific Research (C), for fiscal year 2026, entitled “Estimation of the Statistical Distribution of Hearing Thresholds by Age and Gender and Proposal of International Reference Values,” was subsequently awarded for the purpose of estimating the reference hearing thresholds to be described in the proposed revision of ISO 7029. The outcomes of the present study are planned to be effectively utilized in this project on an ongoing basis.