Duration of Exposure

Pearson Correlation Coefficient

p Value

FEV1

−0.032

0.765

FVC

−0.186

0.081

FEV1/FVC

−0.249

0.019*

PEFR

0.284

0.007*

FEF25% - 75%

−0.038

0.723

SPO₂

0.049

0.648

HR

−0.113

0.290

Carbon mono oxide

0.152

0.155