A pure-tone air-conduction threshold was obtained in a soundproof booth using an automatic audiometer (AD629; Interacoustics, Denmark). The soundproof booth and audiometer were installed in the mobile vehicles, and the maximum permissible noise of the soundproof booth was strictly controlled under the regulation of ANSI-ASA S3.1. Trained professional investigators collected data independently for each ear at the following five frequencies: 0.5, 1.0, 2.0, 4.0, and 8.0 kHz. Hearing impairment was determined according to three categories of frequency (average, low/mid, high). Average-frequency pure-tone threshold was defined as the average of 0.5, 1.0, 2.0, and 4.0 kHz. Low/mid-frequency pure-tone threshold was defined as the average of air-conduction hearing thresholds measured at 0.5, 1.0, and 2.0 kHz. High-frequency pure-tone threshold was defined as the average of air-conduction hearing thresholds measured at 4.0 and 8.0 kHz. Hearing impairment was defined as a pure-tone average (0.5, 1, 2, 4 kHz) threshold level ≥41 decibels for the superior ear.
Ad629
Manufactured by Interacoustics
Sourced in Denmark
The AD629 is a diagnostic audiometer designed for comprehensive hearing evaluations. It offers pure-tone, speech, and special diagnostic testing capabilities. The device is equipped with a range of features to support efficient and accurate hearing assessments.
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Lab products found in correlation
8 protocols using ad629
1
Hearing Impairment Assessment via Soundproof Booth
2
Measuring Noise-Induced Hearing Loss
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Each participant was given a pure-tone audiometry and an otologic examination by a certificated audiologist. The audiometric test was performed in an audiometric room of a mobile physical examination vehicle using an audiometer (Interacoustics AD629, Denmark) with an air conduction headphone (HDA300). Before the test, the audiometer and the headphone were calibrated by the Zhejiang Institute of Metrology according to the Chinese standard (Verification Regulation of Audiological Equipment Pure-tone Audiometers, JJG 388–2012).
The test was performed at least 16 h after occupational noise exposure. Air conduction pure-tone hearing threshold levels at 0.5, 1, 2, 3, 4, 6, and 8 kHz were tested in both ears. Measured hearing thresholds at each frequency were adjusted by subtracting the age- and sex-specific hearing thresholds according to Table A.3 of ISO 1999 2013. The noise-induced permanent threshold shifts (NIPTS) at each frequency for each participant were calculated according to ISO 1999 2013. The mean NIPTS at 3, 4, and 6 kHz in both ears (NIPTS346), representing the extent of hearing loss at high frequencies, was calculated for subsequent analysis.
The test was performed at least 16 h after occupational noise exposure. Air conduction pure-tone hearing threshold levels at 0.5, 1, 2, 3, 4, 6, and 8 kHz were tested in both ears. Measured hearing thresholds at each frequency were adjusted by subtracting the age- and sex-specific hearing thresholds according to Table A.3 of ISO 1999 2013. The noise-induced permanent threshold shifts (NIPTS) at each frequency for each participant were calculated according to ISO 1999 2013. The mean NIPTS at 3, 4, and 6 kHz in both ears (NIPTS346), representing the extent of hearing loss at high frequencies, was calculated for subsequent analysis.
3
Pure-Tone Audiometry for Hearing Assessment
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Hearing was examined without hearing aids by air-conduction pure-tone audiometry at eight frequencies from 0.25 to 8 kHz. For this study, the pure tone-average (PTA) was calculated separately on each ear as the average hearing thresholds from the frequencies of 0.5, 1, 2 and 3 kHz, measured in dB hearing level (HL) as recommended by the Hearing Committee of the American Academy of Otolaryngology—Head and Neck Surgery [18 (link)]. The assessment was done by teams consisting of an audiologist and two trained assistants. The pure-tone audiometry was conducted in sound attenuation booths. Ambient sound levels at the various sites were below the ISO-criteria for test tones in the 0.25–8 kHz range. The audiometers used were type Interacoustics AD629 with TDH-39P supra-aural audiometric headphones with PN51 cushions. For a more detailed description of the procedure, please see Engdahl et al. [3 (link)].
4
Auditory Perception Study of Diverse Participants
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A total of 68 paid participants (43 males and 25 females) were recruited for the experiment; 37 participants were undergraduate students who were remunerated for their time, whereas 31 other participants were non-student voluntary participants. All participants were non-acoustic experts and the majority ethnic group of the participants was Chinese (62 Chinese, 3 Indians, 1 Malays, 1 Filipino, and 1 Myanmar). The participants' ages ranged from 20 to 65 years old Science of the Total Environment https://doi.org/10.1016/j.scitotenv.2019.134571 6 (Mage = 31.7 and SDage = 12.0), and the proportion of participants in their 20s, 30s and >40s were 57.4%, 20.6%, and 22.0% respectively.
Hearing tests were conducted using an audiometer (Interacoustics AD629, Denmark) and the results showed that all participants had normal hearing for all the tested frequencies (0.125, 0.5, 1, 2, 3, 4, 6, and 8 kHz) . Formal ethical approval (IRB-2017-07-025) to conduct this experiment was obtained from the institutional review board of the Nanyang Technological University, Singapore. Following ethical procedures, the participants were informed about this study via written information, and written consent was obtained for all the participants.
Hearing tests were conducted using an audiometer (Interacoustics AD629, Denmark) and the results showed that all participants had normal hearing for all the tested frequencies (0.125, 0.5, 1, 2, 3, 4, 6, and 8 kHz) . Formal ethical approval (IRB-2017-07-025) to conduct this experiment was obtained from the institutional review board of the Nanyang Technological University, Singapore. Following ethical procedures, the participants were informed about this study via written information, and written consent was obtained for all the participants.
5
Auditory Perception in Young Adults
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A total of 21 young adults (mean age = 21.9 years; SD = 2.3; 16 females) provided written consent to participate in the study. Eligibility for participation included (i) detection of pure tones at 20 dB HL in both ears, presented using headphones (AD629, Interacoustics, Denmark), (ii) no contraindications observed in otoscopy, (iii) type A tympanogram (Titan, Interacoustics, Denmark) and (iv) no self‐disclosed neurological disorders. The study protocol was approved by the University of Wisconsin‐Madison Health Sciences Institutional Review Board. Participants were either offered extra credit or compensated at $10/h for their time.
6
Hearing Threshold Measurement Protocol
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Pure tone air conduction hearing threshold measurements at the speech frequencies (i.e., 0.5, 1, and 2 kHz) and the high frequencies (i.e., 3, 4, 6, and 8 kHz) at both ears were performed after excluding conductive hearing impairments by general ear examination of each participant. The participants were out of the occupational noise environment for at least 16 h before the test. The audiometric test was performed in an audiometric room of a mobile physical examination vehicle using an audiometer (Interacoustics AD629, Denmark) with an air conduction headphone (HDA300), which was calibrated by the Zhejiang Institute of Metrology according to the Chinese standard (Verification Regulation of Audiological Equipment Pure-tone Audiometers, JJG 388-2012). The NIPTS at each frequency for each participant were obtained according to Annex A of ISO 1999 (ISO, 2013 ). Measured hearing threshold levels (HTLs) at each frequency of each participant were adjusted by subtracting the age- and sex-specific HTL according to Table B.3 of ISO 1999 (ISO, 2013 ).
7
Hearing Assessment Protocol in ARIC Study
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Pure tone audiometry, assessed at ARIC visit 6 (2016-2017), was completed in a soundproof booth using insert earphones (EARTone 3a; 3M) and an Interacoustics AD629 or Equinox audiometer (Interacoustics A/S). Measurement of air conduction was completed at standard octaves from 500 to 8000 Hz. For each frequency, the hearing threshold was recorded in decibels hearing level (dB HL). We calculated a 4-frequency (0.5, 1, 2, and 4 kHz) pure tone average for each ear and modeled a continuous measure of hearing (better-hearing ear pure tone average [BPTA]) scaled to 10 dB HL, with higher BPTA indicating worse hearing function. Hearing was also categorized according to World Health Organization standards as normal hearing (BPTA≤25 dB HL), mild hearing impairment (BPTA of 26-40 dB HL), moderate hearing impairment (BPTA of 41-60 dB HL), or severe hearing impairment (BPTA>60 dB HL).19
8
Audiometric Assessment of Surgical Impact
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Audiometric measurements of all patients were made before the operation and in the first and sixth months after the operation in a soundproofed cabin in the audiovestibular unit of our clinic. The Interacoustics AD629 (Interacoustics A/S Audiometer, Denmark) device was used. Air pathway and bone pathway hearing thresholds were recorded at frequencies of 500, 1000, 2000, and 4000 Hz. Preoperative and postoperative 6 th -month results were evaluated and compared.
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