Health TrialsbyHealthPanel

Preventing Noise Exposure in Farmworkers

ConditionNoise Exposure
Trial statusNot yet recruiting
Trial phaseNot applicable
Trial typeInterventional
Biological sexAll
Age18+
SponsorSan Diego State University

About this trial

This study will evaluate a farmworker-level hearing loss prevention training designed to improve hearing protection use among farmworkers exposed to hazardous occupational noise. The intervention consists of a culturally and linguistically adapted, Spanish-language digital training module paired with hands-on earplug fitting and coaching.

The primary goals of the study are to (1) assess the feasibility and acceptability of delivering the adapted training in community-based settings, and (2) estimate preliminary effectiveness using an objective measure of hearing protection fit. The study uses a single-arm, pre-post pilot design.

A small group of farmworkers will complete pre- and post-training assessments of earplug fit, as well as brief surveys assessing hearing protection knowledge, attitudes, and perceptions. Qualitative feedback will be collected to inform refinement of the training and guide future scale-up.

Results will inform the development of a subsequent multilevel intervention that integrates supervisor and organizational components.

Eligibility criteria

This trial accepts healthy volunteers

Qualifiers

Adults aged 18 years or older

Currently employed as a farmworker in agricultural settings with routine exposure to occupational noise

Able to understand and provide informed consent in Spanish or English

Disqualifiers

Not currently employed as a farmworker

Medical or ear conditions that preclude safe use of foam earplugs (e.g., acute ear infection, recent ear surgery)

Inability to complete study procedures as determined by study staff

Trial design

Design model

Single group

Treatments tested in this trial

  • Farmworker Hearing Protection Training

    Behavioral

    This behavioral intervention is a brief, farmworker-level hearing protection training. The intervention includes a culturally adapted digital training module (novella-style) focused on noise-induced hearing loss prevention and correct foam earplug use, combined with hands-on earplug fitting and teach-back coaching. The training is delivered in a single session in a community-based setting.

Treatment groups

15 Participants
are divided into 1 treatment group
Group A: Experimental: Farmworker Hearing Protection TrainingExperimental treatment 1 intervention

Trial outcomes

Primary outcomes

1

Change in Earplug Fit (Personal Attenuation Rating)

Change in hearing protection fit measured using the Personal Attenuation Rating (PAR), an objective, device-generated fit-testing metric expressed in decibels (dB). PAR quantifies the level of noise attenuation achieved by an individual's foam earplug insertion. PAR values are obtained using standardized hearing protector fit-testing procedures conducted immediately before and immediately after the training session. PAR scores are reported in dB and typically range from 0 dB (no attenuation) to approximately 40 dB or greater depending on fit and device characteristics. Higher PAR values indicate greater attenuation and better earplug fit.

Time frame
Pre-training and immediately post-training (single session)

Secondary outcomes

1

Change in Hearing Protection Beliefs and Attitudes

Change in self-reported beliefs and attitudes toward hearing protection use, assessed using the 14-item Hearing Protection Beliefs scale. Items are rated on a 4-point Likert scale (1 = disagree to 4 = strongly agree) and summed after reverse-coding negatively worded items. Total scores range from 14 to 56, with higher scores indicating more favorable and accurate beliefs about hearing protection.

Time frame
Pre-training and immediately post-training
2

Acceptability of the Hearing Protection Training

Participant-reported acceptability of the training assessed immediately post-training using the Acceptability of Intervention Measure (AIM). The AIM consists of 4 items rated on a 5-point Likert scale (1 = completely disagree to 5 = completely agree). Item responses are averaged to generate a mean score ranging from 1 to 5, with higher scores indicating greater perceived acceptability of the training.

Time frame
Immediately post-training
3

Feasibility of the Hearing Protection Training

Participant-reported feasibility of the training assessed immediately post-training using the Feasibility of Intervention Measure (FIM). The FIM consists of 4 items rated on a 5-point Likert scale (1 = completely disagree to 5 = completely agree). Item responses are averaged to generate a mean score ranging from 1 to 5, with higher scores indicating greater perceived feasibility of the training.

Time frame
Immediately post-training
4

Appropriateness of the Hearing Protection Training

Participant-reported appropriateness of the training assessed immediately post-training using the Intervention Appropriateness Measure (IAM). The IAM consists of 4 items rated on a 5-point Likert scale (1 = completely disagree to 5 = completely agree). Item responses are averaged to generate a mean score ranging from 1 to 5, with higher scores indicating greater perceived appropriateness of the training.

Time frame
Immediately post-training

Other outcomes

Locations

This trial has no locations.

Sponsors and contacts

Click on the lead sponsor to view all of their trials.

San Diego State University

Lead sponsor

National Institute on Deafness and Other Communication Disorders (NIDCD)

Collaborator

Source ClinicalTrials.gov

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