title: The effect of organic dust exposure on long-term change in lung function: a systematic review and meta-analysis.
abstract: Lung function is a predictor of morbidity and mortality, and the chronic nature of lung function decline allows for preventive initiatives. Proinflammatory constituents of organic dust are considered a possible cause of compromised respiratory health. The aim of this systematic review was to reveal the impact of organic dust exposure on long-term change in lung function. The literature search was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) criteria. Predefined criteria concerned study design: longitudinal, ≥1 year follow-up, ≥50 exposed; exposure measures: organic dust, measured or estimated, in different occupational settings; and outcome measures: change in lung function measured by spirometry. Based on these criteria, 1580 potentially relevant publications were narrowed down to 20 included publications. Quality was evaluated and discussed based on six objectively defined criteria. Overall, 14 studies found some type of association between exposure to organic dust and long-term change in lung function. However, the results were inconsistent and no specific work exposure showed more clear associations to change in lung function. Meta-analysis revealed an overall small significant excess loss in forced expiratory volume in the 1st s for exposed compared with controls of 4.92 mL/year (95% CI 0.14 to 9.69). No significant association was seen overall for forced vital capacity. 12 studies revealed a significant exposure-response relation between organic dust and change in lung function. The results were inconsistent across varying study design and different exposure measures and outcomes. We therefore conclude that there is limited evidence of a causal association between general exposure to organic dust and long-term excess decline in lung function.
authors.affiliation: Section for Environment, Occupation and Health, Department of Public Health and Danish Ramazzini Centre, University of Aarhus, Aarhus, Denmark.
authors.forename: Anneli Cs
authors.initials: AC
authors.lastname: Bolund
authors.affiliation: Institute of Occupational and Environmental Medicine, University of Birmingham, Birmingham, UK.
authors.forename: Martin R
authors.initials: MR
authors.lastname: Miller
authors.affiliation: Section for Environment, Occupation and Health, Department of Public Health and Danish Ramazzini Centre, University of Aarhus, Aarhus, Denmark.
authors.forename: Torben
authors.initials: T
authors.lastname: Sigsgaard
authors.affiliation: Section for Environment, Occupation and Health, Department of Public Health and Danish Ramazzini Centre, University of Aarhus, Aarhus, Denmark.|National Research Centre for the Working Environment, Copenhagen, Denmark.
authors.forename: Vivi
authors.initials: V
authors.lastname: Schlünssen
mesh_terms: D000395:Air Pollutants, Occupational / Q000009:adverse effects* / Q000032:analysis; D004391:Dust; D004731:Endotoxins / Q000009:adverse effects; D004784:Environmental Monitoring; D005541:Forced Expiratory Volume; D006801:Humans; D008137:Longitudinal Studies; D008168:Lung / Q000503:physiopathology; D008171:Lung Diseases / Q000453:epidemiology* / Q000209:etiology* / Q000503:physiopathology; D009784:Occupational Diseases / Q000453:epidemiology* / Q000209:etiology*; D016273:Occupational Exposure / Q000009:adverse effects* / Q000032:analysis; D012129:Respiratory Function Tests; D013147:Spirometry
chemical_list: D000395:Air Pollutants, Occupational; D004391:Dust; D004731:Endotoxins
keywords: Lung function change; epidemiology; occupational exposure; organic dust; review