Self-reported physician-diagnosed chronic obstructive pulmonary disease and spirometry patterns in Vietnam Era US Army Chemical Corps veterans: A retrospective cohort study.

ABSTRACT

BACKGROUND: Research on chronic obstructive pulmonary disease (COPD) and herbicide exposure in Vietnam War veterans is limited. METHODS: Survey data were collected from 3193 US Army Chemical Corps veterans on herbicide exposure and self-reported physician-diagnosed COPD. Three spirometric patterns were used to define airflow obstruction (AFO) (i) FEV1 /FVC < 70% ("fixed ratio"); (ii) FEV1 /FVC < lower limit of normal ("LLN"); and (iii) (FEV1 /FVC < LLN and FVC ≥ LLN and FEV1 Associations between herbicide exposure and self-reported COPD and spirometric-AFO were determined using regression.

RESULTS:

COPD prevalence varied (self-reports 20.1%; spirometry 29.8%, 12.9%, 8.4% by fixed ratio, LLN, and specific obstruction definitions, respectively). Spirometric parameters did not differ by exposure. Self-reported COPD and herbicide exposure were significantly associated (adjusted odds ratio [aOR] = 1.82, 95% confidence intervaI 1.48,2.24). No association was found between spirometric-AFO and herbicide exposure.

CONCLUSIONS:

A significant association was found between herbicide exposure and self-reported physician-diagnosed COPD but not when COPD diagnosis was based on spirometry.