Recruiting

Hearing Protection

Sponsor:

San Diego State University

Code:

NCT07554378

Conditions

Noise Exposure

Hearing Loss, Noise-Induced

Occupational Exposure

Eligibility Criteria

Sex: All

Age: 18+

Healthy Volunteers: Accepted

Interventions

Multilevel Hearing Protection Training

Study Details

Brief summary:

This study will test a program to reduce noise exposure and prevent hearing loss among farmworkers. Farmworkers are often exposed to high levels of noise from machinery, which can lead to hearing loss over time.

Farms will be randomly assigned to either receive the program or serve as a comparison group. The program includes a short educational video, group discussion, and hands-on training on how to use hearing protection (such as earplugs). Supervisors will also receive brief training on how to support hearing protection use in the workplace.

Participants will wear a small device (dosimeter) during a work shift to measure noise exposure before the program and again about one month later. Participants will also complete surveys about their knowledge, attitudes, and behaviors related to hearing protection.

A subset of participants will be invited to take part in interviews to understand barriers and facilitators to using hearing protection and implementing the program.

The results of this study will help inform future efforts to improve hearing health and reduce noise exposure in agricultural settings.

Conditions

Noise Exposure

Hearing Loss, Noise-Induced

Occupational Exposure

Study ID

NCT07554378

Start date

Oct 30, 2026

Status verified date

Nov, 2026

Completion date

Jul, 2032

Anticipated

Primary completion date

Jan, 2031

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: All

Age: 18+

Healthy Volunteers: Accepted

Inclusion Criteria:

  • Age 18 years or older
  • Currently employed as a farmworker or supervisor at a participating farm
  • Able to provide informed consent
  • Able to understand and communicate in Spanish or English

Exclusion Criteria:

  • Not currently working at a participating farm at the time of recruitment
  • Unable or unwilling to wear a personal noise dosimeter during a work shift
  • Unable to complete study procedures (e.g., surveys or training)

Study Design

Enrollment

200 participants

Anticipated

Allocation

Randomized

Intervention Model

Parallel Assignment

Primary purpose

Prevention

Interventions and Outcome Measures

Arms

experimental: Intervention Arm (Multilevel Intervention Group)

Participants at farms assigned to the intervention arm will receive a multilevel intervention that includes a brief educational video on noise exposure and hearing loss, group discussion, and hands-on training on proper use of hearing protection (e.g., earplugs). Supervisors will receive a brief training on identifying noise hazards and supporting hearing protection use among workers. The intervention is delivered in a community or workplace setting by trained study staff or community health workers.

no intervention: Control Arm (Usual Practice)

Participants at farms assigned to the control arm will not receive the intervention during the study period. They will complete study assessments, including dosimetry and surveys. The intervention will be offered after study completion.

Interventions

Multilevel Hearing Protection Training

The intervention is a multilevel behavioral training program designed to reduce occupational noise exposure and promote hearing protection use. Farmworkers participate in a session that includes a brief educational video on noise exposure and hearing loss, group discussion, and hands-on instruction on proper use of hearing protection (e.g., earplugs). Supervisors receive a brief training on identifying noise hazards and supporting hearing protection use among workers. The intervention is intended to be delivered in a group or 1:1 setting by trained research staff or community health workers.

Primary outcome measure

  • Change in Time-Weighted Average Noise Exposure (dBA) [ Time Frame: Baseline and approximately 1 month post-intervention ]
  • Change in Noise Dose (%) [ Time Frame: Baseline and approximately 1 month post-intervention ]

Central Contacts and Locations

Central contacts

Laura Coco, PhD, AuD

16195943151lcoco@sdsu.edu

Locations

San Diego State University

Recruiting

San Diego, California, United States, 92182

Contacts

Laura Coco, PhD, AuD

6195943151lcoco@sdsu.edu

More Information

Sponsor

San Diego State University

Last update posted

Nov 9, 2026

Last verified

Nov, 2026

Keywords

  • farmworkers
  • agriculture
  • hearing protection
  • earplugs
  • occupational noise
  • hearing conservation
  • implementation science
  • Community Health Workers
  • Workplace intervention
  • Cluster randomized trial

Trial information was received from ClinicalTrials.gov and was last updated on 2026-11-10. This information was provided to ClinicalTrials.gov by San Diego State University on 2026-11-09. Recruitment status is synced daily from ClinicalTrials.gov and may not reflect the sponsor's current status. Confirm during your call.