Pulmonary function, respiratory symptoms and associated factors among cotton-ginning workers at Gondar city, Northwest Ethiopia: a comparative cross-sectional study.

Background: Cotton dust is one of the risk factors for occupational respiratory diseases, a condition characterized by reduced pulmonary function and overwhelming respiratory symptoms. Therefore, this study aimed to determine pulmonary function parameters, respiratory symptoms, and associated factors among cotton-ginning workers at Gondar city, northwest Ethiopia.

Methods: A comparative cross-sectional study was conducted on 166 (83 cotton-ginning workers and 83 healthy controls) individuals. Simple random sampling and convenience sampling techniques were used to recruit cotton-ginning workers and controls, respectively. Pulmonary function parameters were measured using Spirometer. Data on respiratory symptoms were collected using the Modified American Thoracic Society questionnaire. We used Chi-square (χ) and independent "t" test to compare the outcome variables between the two groups. Binary logistic regression was used to identify the associated factors of respiratory symptoms among cotton-ginning workers. The strength of association was determined using an adjusted odds ratio (AOR) with its 95% confidence interval (CI) and statistical significance was decided at P<0.05.

Results: Cotton-ginning workers had reduced FVC, FVC%, FEV1, FEV1/FVC%, PEFR and FEF25-75%) as compared with controls. The prevalence of overall respiratory symptom was 68.6% (95% CI: 57.8, 77.8) among cotton-ginning workers and 19.2% (95% CI: 12, 29.3) among controls. Females (AOR=5.9, 95% CI: 1.19, 29.9), those with primary and secondary education (AOR=7.9, 95% CI: 1.2, 52), working at ginning department (AOR=9.4, 95% CI 1.6, 53) and pressing department (AOR=8.0, 95% CI: 1.3, 48) and not using personal protective equipment (PPE) (AOR=9.1, 95% CI: 1.8, 45.1) had an increased odds of having respiratory symptoms.

Conclusion: Reduced pulmonary function parameters and a higher prevalence of respiratory symptoms were observed among cotton-ginning workers than controls. This suggests the need to tailor workplace safety measures to prevent occupational respiratory diseases.