Comparison1

Comparison2

Theoretical values

Before exposure

p

Before exposure

After exposure

p

FEV1

2.39 ± 0.28

1.93 ± 0.87

<0.0001

1.93 ± 0.87

1.76 ± 0.57

0.0009

FVC

2.83 ± 0. 30

1.99 ± 0.87

<0.0001

1.99 ± 0.87

1.69 ± 0.48

0.0393

FEV1/FVC

84.47 ± 2.88

96.85 ± 8.43

<0.0001

96.85± 8.43

104.31 ± 9.4

0.4004

FEF 25/75

3.06 ± 0.46

2.78 ± 1.21

0.0516

2.78 ± 1.21

2.31 ± 0.85

0.0001