Occupational exposures and chronic obstructive pulmonary disease: a hospital based case-control study

Area of Science:

• Occupational Health
• Respiratory Medicine
• Epidemiology

Background:

• Occupational exposures are a known risk factor for chronic obstructive pulmonary disease (COPD).
• This study examines occupational exposures in a population with high rates of tuberculosis and smoking, both significant COPD risk factors.

Purpose of the Study:

• To investigate the association between lifetime occupational exposures and COPD risk.
• To assess the impact of occupational exposures, smoking, and tuberculosis on COPD development in a specific population.

Main Methods:

• A case-control study involving 110 COPD cases and 102 matched controls from respiratory clinics.
• Occupational exposure histories were collected via interviews and supplemented with the ALOHA Job Exposure Matrix (JEM).
• Logistic regression models were used to calculate odds ratios (ORs), adjusting for smoking and tuberculosis history. Population attributable risk (PAR%) was also computed.

Main Results:

• High cumulative biological dust exposure (OR 2.1) and gas/fumes exposure (OR 1.8) from JEM were associated with increased COPD risk.
• Self-reported high dust exposure-years (OR 5.9) and chemical/gas/fumes exposure-years (OR 3.6) showed stronger associations.
• Smoking (OR 5.0-5.5) and tuberculosis (OR 7.7-8.1) were significant risk factors for COPD.

Conclusions:

• Lifetime occupational exposures are significant contributors to COPD risk, independent of smoking.
• The findings highlight the importance of considering occupational exposures in COPD etiology, particularly in high tuberculosis burden settings.