Occupational Noise ExposureNCT07806123
OCCUPATIONAL NOISE AND CHEMICAL EXPOSURE EFFECTS ON AUDITORY AND VESTIBULAR FUNCTION
An observational study of Occupational Noise Exposure, run by Ondokuz Mayıs University at 1 site in Turkey (Türkiye).
Trial summary
This study aims to investigate the effects of occupational noise exposure on hearing and auditory functions among individuals working in noisy environments. The study evaluates the relationship between occupational noise exposure and hearing-related outcomes. Read more about this study
- Who is it for?
- Ages 20 to 60 years, men onlyHealthy volunteers can take part
- Conditions the study is for
- Occupational Noise Exposure
- How many people
- 50 participants
- Where
- 1 siteTurkey (Türkiye)
- Study dates
- 3 Sep 2026to 10 Mar 2027
- Phase
- Observational
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 20 to 60 years
- Men only
- Healthy volunteers accepted
- Adult
Study population: Fuel station employees aged 20-60 years and healthy individuals with similar sociodemographic characteristics who had no occupational exposure to noise or chemicals.
Who may be able to join
- Male participants aged 20-60 years who had been working at a fuel station for at least two years, had no hearing loss on their pre-employment audiogram, and had no history of balance loss or otologic surgery.
Who cannot join
- Individuals with middle ear pathology, a history of hearing loss, vestibular disease, or neurological or psychiatric disorders.
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
Turkey (Türkiye)1 site
Ondokuz Mayıs University
Samsun, 55139
Ondokuz Mayıs University, +90 362 312 19 19, iletisim@omu.edu.tr
Handan TURAN DİZDAR, PhD
About this study
Official title: EFFECTS OF OCCUPATIONAL NOISE AND CHEMICAL EXPOSURE ON AUDITORY AND VESTIBULAR FUNCTION IN FUEL STATION EMPLOYEES
This study aims to investigate the effects of occupational noise exposure on hearing and auditory functions among individuals working in noisy environments. The study evaluates the relationship between occupational noise exposure and hearing-related outcomes.
- Conditions
- Occupational Noise Exposure
- Keywords
- Chemical esposure, Fuel station employees, Noise-induced hearing loss, Occupational exposure, Ototoxicity, Vestibulotoxicity
- Medical subject headings
- Hearing Loss, Noise-Induced, Ototoxicity
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
| Study group | Role | What they receive |
|---|---|---|
| Study Group | Fuel station workers exposed to occupational noise and chemical substances. | |
| Control Group | Healthy individuals with similar sociodemographic characteristics and no exposure to occupational noise or chemical substances. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Pure-Tone Audiometry Hearing Thresholds
Hearing thresholds were assessed by pure-tone audiometry at 250, 500, 1000, 2000, and 4000 Hz in both ears and compared between the study and control groups.
Measured: Baseline
Secondary outcomes (1)
Acoustic Reflex Thresholds
Ipsilateral and contralateral acoustic reflex thresholds were assessed at 500, 1000, 2000, and 4000 Hz and compared between the study and control groups.
Measured: Baseline
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted8 Sep 2026
- Study start3 Sep 2026 (estimated)
- Primary completion10 Feb 2027 (estimated)
- Study completion10 Mar 2027 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Occupational Noise ExposureStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Cohort
- Time perspective
- Cross-sectional
- Enrolment
- 50 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Ondokuz Mayıs University
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Handan Turan Dizdar, Ondokuz Mayıs University
- Investigators
- Handan TURAN DİZDAR, PhD, Principal investigator, Ondokuz Mayıs University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07806123
- Sponsor's protocol ID
- 2025000065-2
- Status last verified
- Sep 2026
- First submitted
- 2 Sep 2026
- Last updated
- 8 Sep 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: Individual participant data will not be shared with other researchers. Only aggregate study results will be reported in the publication.
Publications
Roggia SM, de Franca AG, Morata TC, Krieg E, Earl BR. Auditory system dysfunction in Brazilian gasoline station workers. Int J Audiol. 2019 Aug;58(8):484-496. doi: 10.1080/14992027.2019.1597286. Epub 2019 Apr 24.
PubMed 31017499