Smoking Status: Yes

FEV1 (Liters)

Mean Value

95% CI

P Value

Proppant Workers

3.5

3.26 - 3.82

0.01

NHANES III

3.2

3.15 - 3.21

FVC (Liters)

Mean Value

95% CI

P value

Proppant Workers

4.6

4.28 - 4.87

0.03

NHANES III

4.2

4.2 - 4.27

Smoking Status: No

FEV1 (Liters)

Mean Value

95% CI

P Value

Proppant Workers

3.9

3.76 - 4.04

<0.001

NHANES III

3.6

3.52 - 3.59

FVC (Liters)

Mean Value

95% CI

P Value

Proppant Workers

4.9

4.69 - 5.06

<0.001

NHANES III

4.5

4.42 - 4.50

MEDIAN HEIGHT ≥69 inches

FEV1 (Liters)

Mean Value

95% CI

P Value

Proppant Workers

3.8

3.67 - 3.97

<0.0001

NHANES III

3.5

3.47 - 3.53

FVC (Liters)

Mean Value

95% CI

P Value

Proppant Workers

4.9

4.69 - 5.06

<0.02

NHANES III

4.6

4.55 - 4.61

MEDIAN HEIGHT <69 inches

FEV1 (Liters)

Mean Value

95% CI

P Value

Proppant Workers

3.7

3.37 - 3.95

0.0006

NHANES III

3.1

3.06 - 3.13

FVC (Liters)

Mean Value

95% CI

P Value

Proppant Workers

4.5

4.11 - 4.80

0.027

NHANES III

4.0

3.96 - 4.02

Median Age ≥ 39 Years

FEV1 (Liters)

Mean Value

95% CI

P Value

Proppant Workers

4.0

3.9 - 4.16

0.372

NHANES III

4.0

3.94 - 3.99

FVC (Liters)

Mean Value

95% CI

P Value

Proppant Workers

5.1

4.9 - 5.2

0.017

NHANES III

4.9

4.88 - 4.9

Median Age < 39 Years