Chronic Obstructive Pulmonary Disease and Asthma in Workers at Navanakorn Industrial Zone, Thailand

April 15, 2026 updated by: Narongkorn Saiphoklang, MD, Thammasat University

The goal of this observational study is to determine the prevalence of asthma and chronic obstructive pulmonary disease (COPD) among workers in an industrial zone in Thailand.

The main question the study aims to answer is:

What is the prevalence of asthma and COPD among workers in Thailand? Participants will complete a questionnaire on respiratory symptoms and undergo pulmonary function testing.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

This study is a cross-sectional study. The study aims to determine the prevalence of asthma and COPD among workers in the Navanakorn Industrial Zone, Thailand. Thai subjects aged 18 years or older are included in the study.

Study Type

Observational

Enrollment (Estimated)

310

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

  • Thailand
    • Changwat Pathum Thani
      • Pathum Thani, Changwat Pathum Thani, Thailand, 12120
        • Recruiting
        • Faculty of Medicine, Thammasat University
        • Contact:
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Sampling Method

Non-Probability Sample

Study Population

Subjects aged 18 years or older who work or live in the Navanakorn Industrial Zone, Thailand.

Description

Inclusion Criteria:

  • Age 18 years or older

Exclusion Criteria:

  • Inability to perform spirometry

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Workers
Workers aged 18 years or older at Navanakorn industrial zone, Thailand
Diagnostic test: Pulmonary function test
Spirometry with bronchondilator test will be performed.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Prevalence of asthma among workers at the Navanakorn Industrial Zone
Time Frame: Baseline
Prevalence rate of asthma among workers in the Navanakorn Industrial Zone
Baseline
Prevalence of COPD among workers in the Navanakorn Industrial Zone
Time Frame: Baseline
Prevalence rate of COPD among workers in the Navanakorn Industrial Zone
Baseline

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Prevalence of abnormal lung function among workers in the Navanakorn Industrial Zone
Time Frame: Baseline
Prevalence rate of abnormal lung function among workers in the Navanakorn Industrial Zone
Baseline

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Thammasat University

Investigators

  • Principal Investigator: Narongkorn Saiphoklang, MD, Thammasat University Faculty of Medicine

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

September 1, 2025

Primary Completion (Actual)

March 31, 2026

Study Completion (Estimated)

May 31, 2026

Study Registration Dates

First Submitted

January 18, 2026

First Submitted That Met QC Criteria

January 29, 2026

First Posted (Actual)

February 3, 2026

Study Record Updates

Last Update Posted (Actual)

April 17, 2026

Last Update Submitted That Met QC Criteria

April 15, 2026

Last Verified

April 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • MTU-EC-IM-1-024/68

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

IPD and documents will be available for sharing immediately after publication for a period of 2 years.

IPD Sharing Time Frame

IPD and documents will be available for sharing immediately after publication for a period of 2 years.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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