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
- Are there results?
- Not yet: the study is under way
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.
- More trials run by Ondokuz Mayıs UniversityThe sponsor's other registered studies.
- 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
Study at a glance
From the registry record, last updated by the sponsor on 8 Sep 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- EFFECTS OF OCCUPATIONAL NOISE AND CHEMICAL EXPOSURE ON AUDITORY AND VESTIBULAR FUNCTION IN FUEL STATION EMPLOYEES
- ClinicalTrials.gov ID
- NCT07806123
- Acronym / sponsor ID
- 2025000065-2
- Conditions
- Occupational Noise Exposure
- Keywords
- Chemical esposure, Fuel station employees, Noise-induced hearing loss, Occupational exposure, Ototoxicity, Vestibulotoxicity
- Study type
- Observational
- Recruitment status
- Not yet recruiting
- Enrolment
- 50 participants (estimated)
- Lead sponsor
- Ondokuz Mayıs UniversityUniversity, hospital or other
- Study start
- 3 Sep 2026 (estimated)
- Primary completion
- 10 Feb 2027 (estimated)
- Study completion
- 10 Mar 2027 (estimated)
- First posted
- 8 Sep 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
Study design
- Observational model
- Cohort
- Time perspective
- Cross-sectional
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| 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. |
Who may qualify
- Ages
- 20 to 60 years
- Sex
- Male only
- Healthy volunteers
- Accepted
- Age groups
- 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.
Key inclusion criteria (1 listed)
- 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.
Key exclusion criteria (1 listed)
- Individuals with middle ear pathology, a history of hearing loss, vestibular disease, or neurological or psychiatric disorders.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Pure-Tone Audiometry Hearing Thresholds
Time frame: Baseline
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.
1 secondary outcome
Acoustic Reflex Thresholds
Time frame: Baseline
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 8 Sep 2026.
- Background: PubMed 31017499Roggia 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.
- Vestibular Dysfunction - StatPearls, NCBI BookshelfLink provided by the sponsor.
- Individual participant dataSharing planned: No. Individual participant data will not be shared with other researchers. Only aggregate study results will be reported in the publication.
Related trials for Occupational Noise Exposure
Recruiting
Non-Invasive System to Deliver Therapeutic Hypothermia for Protection Against Noise-Induced Hearing Loss
Noise Exposure, Noise-induced Hearing Loss
Not yet recruiting
Fatigue and Hearing Performance of Healthy Volunteers Acutely Exposed to Occupational Noise ( FATIGAUDIT)
D001305, Auditory Fatigue
Not yet recruiting
A Multilevel Intervention to Prevent Noise Exposure in Farmworkers
Noise Exposure, Hearing Loss, Noise-Induced
Active, not recruitingObservational study
Environmental and Occupational Noise Exposure in Relation to Incidence of Type 2 Diabetes
Environment Related Disease
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Handan TURAN DİZDAR, PhD principal investigator
Ondokuz Mayıs University
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Occupational Noise Exposure, run by Ondokuz Mayıs University at 1 site in Turkey (Türkiye).
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: opening soon, as of the sponsor's last update on 8 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Turkey (Türkiye). Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Handan TURAN DİZDAR, PhD (+90 505 597 06 27, handan.dizdar@omu.edu.tr), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Pure-Tone Audiometry Hearing Thresholds (time frame: Baseline). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT07806123, which also lists 1 linked publication.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 8 Sep 2026.