Fixed Airflow Obstruction in Asthma Can Be Identified Early by Low FEF25-75% and is Associated with Environmental Exposure.

As airflow obstruction worsened, there was an increasing trend in the proportions of males ( P =0.009 for trend test), early onset of asthma ( P <0.001 for trend test), asthma lasting > 50 years ( P =0.015 for trend test), and CB ( P =0.021 for trend test) ( Table 3 ).

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