FEV1 (Liters)

Variable

Parameter Estimates

Standard Error

P-Value

Median Age (39 Years)

−0.98

0.0005

<0.0001

Race (Black vs White)

−0.31

0.02

<0.0001

Smoking History (pk-yrs)

−0.31

0.0006

<0.0001

Median Height (69 Inches)

0.41

0.02

<0.0001

Proppant Workers vs NHANES III

0.11

0.07

0.13