Overall Male Population: Without Stratification

FEV1 (Liters)

Mean Value

95% CI

P Value

Proppant Workers

3.8

3.66 - 3.92

<0.0001

NHANES III

3.3

3.30 - 3.35

FVC (Liters)

Mean Value

95% CI

P Value

Proppant Workers

4.8

4.63 - 4.94

<0.0001

NHANES III

4.3

4.30 - 4.35