Table 1.

proportion of workers with airway obstruction, by different criteria and reference equations, in those with symptoms of byssinosis and in the total mill population

Metric of airflow obstruction	Workers with symptoms of byssinosis (n=58)				Total mill population (n=1724)
	NHANES (7)	GLI (9)	Indian (10)	Pakistani (11)	NHANES	GLI	Indian	Pakistani
FEV1<80% predicted	40%	41%	14%	12%	1.3%	1.4%	0.5%	0.4%
FEV1/FVC ratio<LLN	12%	24%	21%	NA	0.4%	0.8%	0.7%	NA

NHANES: National Health and Nutrition Examination Survey III

GLI: Global Lung Initiative

NA: not available